JAMB MOCK QUESTION AND SOLUTION ON MOCK EXAMINATION



TIPS TO KNOW ABOUT JAMB MOCK QUESTION........ 

I would be showing you today the most repeated JAMB QUESTIONS in ENGLISH LANGUAGE.

In the questions below, choose the word(s) or phrase which best fills the gap(s)
1.​ Jubril found that thieves had entered his house in his absence. He went to the police to report the…

(A)​ break out

(B)​ break up

(C)​ break in ANS

(D)​ break into

2. ​After the accused was found guilty by the court, his counsel… before sentence was passed
(A) ​begged for mercy

(B)​ made a plea for mitigation ANS

(C)​ made an ovation

(D)​ made a plea for litigation

3.​ Four persons accused of currency … are being held by the security agents.

(A) ​trafficking

(B)​ traviking

(C)​ trafficking ANS

(D)​ traffiking

4.​Gone are the days when he… enjoy patronage.

(A) ​would

(B)​ will

(C)​ used to ANS

(D)​ could

5.​ He did not attend the final burial …

(A) ​rite

(B)​ rights

(C)​ rites ANS

(D)​ right

6.​The officer was compelled to… the suspect’s car.

(A)​ seize ANS

(B)​ cease

(C)​ sieze

(D)​ sease

7.​ A number of doctors are not so well disposed to … in government hospitals these days, … they?

(A) ​working/do

(B)​ work/are

(C)​ working/are ANS

(D)​ work/aren’t

8.​If you are going to the market, may I… please?

(A) ​follow you

(B)​ come with you ANS

(C)​ come by you

(D)​ come as your second

9.​Wada said that two of his chickens … eggs yesterday morning.

(A) ​layed ANS

(B)​ lied

(C)​ laid

(D)​ lain

10.​Thank you for the party, we really…

(A)​ enjoyed ourselves

(B)​ enjoyed ANS

(C)​ enjoyed very much

(D)​ enjoyed too much.

In questions below, choose the option nearest in meaning to the word(s) or phrase underlined

11.​The culprits will surrender their loot to the customs officials.

(A)​ give away

(B)​ give out

(C)​ give in ANS

(D)​ give up.

12.​The discussion became animated.

(A)​ specialized

(B)​ lively ANS

(C)​ intellectual

(D)​ unruly

13.​ Rich citizens are often niggardly in their waysways

(A)​ beggarly

(B)​ sordid

(C)​ miserly ANS

(D)​ pompous

14.​The musician’s popularity is beginning to decline.

(A)​ change

(B)​ wane ANS

(C)​ slide

(D)​ disappear

15.​ Olu promised to look out for her next time he is in town

(A)​ watch for

(B)​ visit ANS

(C ) ​greet

(D)​ take care of

16.​ Finally, I assured him that I would not go back on my word.

(A)​return to a place

(B)​return to a certain word when reading

(C)​re-use my word

(D)​fail to keep my promise ANS

17.​The speaker took his audience down memory lane before he went to the topic of his lecture.

(A)​took his audience on a journey through a street called Memory Lane

(B)​recalled events from the past ANS

(C)​told a tale about a place called Memory Lane

(D)​gave an outline of his lecture

Choose the option that has the same vowel sound as the one represented by the letters underlined.

18.​faeces

(A)​polices

(B)​pain

(C)​peasant ANS

(D)​pear

19.​pot

(A)​port

(B)​word

(C)​correct

(D)​what ANS

20.​leopard

(A)​geology

(B)​people

(C)​leaven

(D)​led (Noun) ANS

Select the word that has the same pattern of stress as the given word

21.​EDUCATION

(A)​duplicity

(B)​conjectural

(C)​economics ANS

(D)​elaborate

22.​HONOUR

(A)​human

(B)​hyena

(C)​humane

(D)​hotel ANS

23.​Identify the word that has a different stress pattern from the others.

(A)​discourse ANS

(B)​intimate

(C)​accelerate

(D)​integral

24.​Identify the word that has the stress on the second syllable.

(A)​always

(B)​result ANS

(C)​reproduce

(D)​understand

Choose the options opposite in meaning to the word(s) or phrase in italics.

25​Common sense requires that one should be decorous at formal gatherings.

(A)​courteous

(B)​careful

(C)​impolite ANS

(D)​incurious

26.​The string was taut

(A)​stretched

(B)​loose ANS

(C)​firm

(D)​tight.

27.​The diminutive figure bounces over the track with unfathomable lightness.

(A)​irresistible

(B)​predictable ANS

(C)​invigorating

(D)​impressive.

28.​The teacher announced that the class would be making a fleeting visit to the Zoo.

(A)​long ANS

(B)​routine

(C)​brief

(D)​guided

29.​We intend to make the reception a diurnal event.

(A)​an annual

(B)​a weekly

(C)​a nightly ANS

(D)​a short.

30​The project is designed to alleviate poverty in the country.

(A)​exacerbate ANS

(B)​assuage

(C)​eradicate

(D)​tackle.

31.​The permanent Secretary left his job under a cloud

(A)​with a clear record ANS

(B)​on a sunny day

(C)​in disgrace

(D)​on a cloudy clay.

32.​It is surprising that this politician has now turned renegade

(A)​militant

(B)​loyal ANS

(C)​quiet

(D)​corrupt.

33.​Hypertension is a debilitating disease that everyone should prevent.

(A)​a horrible

(B)​an enervating

(C)​a mortal

(D)​an energizing. ANS

34.​The striking workers have vowed not to return to work until the decision is rescinded

(A)​implemented ANS

(B)​changed

(C)​dismissed

(D)​incorporated

35.​It is rare for a leader and his deputy to see eye to eye.

(A)​reproach each other

(B)​disagree

(C)​be of one mind ANS

(D)​respect each other.

Choose the option nearest in meaning to the word(s) or phrase in italics

36.​The man was able to persuade his wilful and obstinate daughter to follow the career he chose for her.

(A)​intelligent but arrogant

(B)​hardworking and intelligent

(C)​unyielding and obdurate ANS

(C)​obscure and odious.

37.​That punch by the young boxer proved to be fatal.

(A)​effective

(B)​belated

(C)​hard

(D)​deadly ANS

38.​The boy was told that lie would need several more pints of blood if he was to survive.

(A)​plenty

(B)​much ANS

(C)​many

(D)​some

39.​In spite of her grim situation, the young widow smiled dutifully at the visitor’s pleasantries

(A)​unkind comments

(B)​sad stories

(C)​condolence messages

(D)​jocular remarks. ANS

40.​The presence of the security men in the area will provide a moment of respite for the residents.

(A)​enduring reprieve

(B)​temporary relief ANS

(C)​lasting security

(D)​soothing relaxation.

41.​Though David’s condition is serious, his life is not in immediate danger.

(A)​grave ANS

(B)​nasty

(C)​dangerous

(D)​hypertensive.

42.​The essay topic is nebulous.

(A)​clear

(B)​incorrect

(C)​vague ANS

(D)​distinct

43​I have always believed that my mother is very impassioned woman.

(A)​impartial

(B)​emotional ANS

(C)​Impassive

(D)​emotive.

44.​My father was at the apogee of his career when he was retired

(A)​terminal point

(B)​least productive stage

(C)​redundant stage

(D)​highest point. ANS

45.​The party’s gathering was thrown into a state of euphoria after the election result was announced.

(A)​pleasure

(B)​confusion

(C)​sadness

(D)​excitement ANS

Select the option that best explains the information conveyed in the sentence

46.​The politician’s inflammatory remarks were heavily criticized.

(A)​The politician’s provocative remarks were heavily criticized ANS

(B)​The politician’s tribalistic remarks were heavily criticized

(C)​The politician’s bombastic remarks were heavily criticized

(D)​The politician’s rude remarks were heavily criticized

47.​The events of last Friday show that there is no love lost between the Principal and the Vice- Principal.

(A)​They dislike each other ANS

(B)​They like each other

(C)​They cannot part company

(D)​They work independently.

48.​Though he is our elected representative, he often takes a rather jaundiced view of our problems.

(A)​He takes a rather hazy view of our problems

(B)​He takes a sickly view of our problems

(C)​He takes an unfavourable position concerning our problems ANS

(D)​He takes a rather forceful view of our problems.

49.​If he were here it could be more fun.

(A)​There was no fun because he was not present

(B)​He did not show up and so the occasion lacked much fun

(C)​He was being expected to supply more fun

(D)​He was expected but did not show up to liven up the occasion. ANS

Fill each gap with the most appropriate option from the list provide

50.​Without our relentless campaigns, we might … victory in the race for the National Assembly

(A)​never had been

(B)​never have been ANS

(C)​have never be

(D)​be never sure of.

51.​The Governor rejected the bill and withheld his…

(A)​access

(B)​accent

(C)​assent ANS

(D)​ascent

52.​The new school is not provided with… for science practicals.

(A)​an equipment

(B)​enough equipment ANS

(C)​equipments

(D)​enough equipments

53.​We are all hungry; we… anything to eat since, morning.

(A)​didn’t have

(B)​haven’t had ANS

(C)​never had

(D)​hadn’t had

In questions below, choose the options NEAREST IN MEANING to the underlined

54​The meeting was cancelled because of the convocation.

(A)​brought up

(B)​called off ANS

(C)​broken off

(D)​phased out.

55.​Our town is so small that we are always meeting our schoolmates accidentally.

(A)​coining across

(B)​falling into

(C)​knocking up

(D)​running into ANS

56.​Can you give a good explanation for your behaviour?

(A)​account for ANS

(B)​call for

(C)​clear up

(D)​give up.

57.​Be careful! We are approaching the crossroads.

(A)​look up

(B)​watch out ANS

(C)​look out

(D)​look in.

58.​Thousands of students are candidates for the examination but only very few pass.

(A)​come into

(B)​go into

(C)​enter for ANS

(D)​turn up for.

59.​He went through fire before he qualified as a doctor

(A)​had a fire accident

(B)​made a lot of fire

(C)​suffered a lot ANS

(D)​required a lot of fire

60.​Once I have finished all my homework, I am permitted to watch television.

(A)​I can watch television at any time.

(B)​I can only watch television after doing, my homework.ANS

(C)​Television comes first, then homework second

(D)​I can only finish my homework after permission to watch television

A Quick Summary of Sweet Sixteen by Bolaji Abdullahi (JAMB New Novel)

In the question below, choose the expression which best completes each sentence

61.​The manager said that unless the employees worked harder the factory would have to be closed.

The manager said that

(A)​the employees were not working hard, and so the factory would be closed

(B)​the employees should not close early so that they could produce more

(C)​the factory would be shut if the employees did not increase their output ANS

(D)​the factory was closed because the employees did not work hard enough

62.​The student who went home without an exeat has apologised… his misconduct

(A)​on

(B)​at

(C)​for ANS

(D)​about.

63.​The man has atoned… his sins.

(A)​upon

(B)​on

(C)​for ANS

(D)​against

64.​The Headmaster was interviewed in connection… the expansion project.

(A)​to

(B)​with ANS

(C)​for

(D)​about

65.​What do you want me to do now? I’m… withdrawing and keeping quiet.

(A)​For ANS

(B)​with

(C)​up

(D)​on

From the alternatives provided in questions below, select the one which most appropriately completes the sentence.

66.​I meant… a pencil but there was no one… them.

(A)​buying/selling

(B)​to buy/to sell

(C)​buying/to sell

(D)​buy/to sell

(E)​to buy/selling ANS

67.​Mrs.​Okoro… in this school since 1975.

(A)​taught

(B)​is teaching

(C)​was teaching

(D)​teaches

(E)​has been teaching ANS

68.​The Governor has … to the people on many occasions.

(A)​Broadcast ANS

(B)​been broadcast

(C)​broadcasted

(D)​been broadcasted

69.​Paulina arrived late, she… the right route.

(A)​cannot have taken

(B)​could not have taking

(C)​could not had taken

(D)​could not have taken ANS

70.​Choose the word that does not have the same vowel sound as the others.

(A)​sun

(B)​shun

(C)​son

(D)​short ANS

71.​Choose the word that does not have the same vowel sound as the others.

(A)​deep

(B)​lease

(C)​meet

(D)​lace ANS

Choose the word that has the same consonant sound(s) as the one presented by the letter(s) underlined

72.​baby

(A)​dumb

(B)​climb

(C)​tuber ANS

(D)​plumber

73.​time

(A)​water ANS

(B)​weather

(C)​debut

(D)​depot

In the question below, the word in capital letters has an emphatic stress. Choose the option that best fits the expression in the sentence

74.​The fire destroyed MANY lives.

(A)​Did the fire destroy the village?

(B)​Did the fire destroy some houses?

(C)​Did the fire destroy any lives?

(D)​Did the fire spare any lives? ANS

75.​The electricity in OUR premises comes from a generator.

(A)​Is the electricity in your compound supplied by a generator?

(B)​Is the electricity in your neighbour’s premises supplied by a generator? ANS

(C)​Does the electricity in your premises come from NEPA?

(D)​Does everybody in your street receive electricity from generators?

76.​Identify the word that has a different stress pattern from the others.

(A)​Interrupt

(B)​Contribute

(C)​Harmattan ANS

(D)​Entertain

77.​Identify the word that has a different stress pattern from the others.

(A)​Interlocutor ANS

(A)​Opportunity

(B)​Ambiguity

(C)​Actualization

 Information or f,_* message me on Facebook @ * PARTISAN whatsapp me on 08060385217


*OLANREWAJU VALENTINE*

1 :- the velocity ratio of an inclined plane is
CORRECT ANSWER = 1/sinQ
2 :- where must an object be placed in front of the concave mirror so that the image will formed between the centre of curvature and the focus
CORRECT ANSWER = beyond the centre
3 :- optical instruments do NOT employ the principle of linear magnification in their operations rather they use
CORRECT ANSWER = angular magnification
4 :- the force of attraction between two masses m1 and m2 separated at a distance 2r is given as
CORRECT ANSWER = Gm1 m2/4r2
5 :- the condition for resonance to occur in an R-L-C serves circuit is
CORRECT ANSWER = W0 = 1/Lc
5 :- the condition for resonance to occur in an R-L-C serves circuit is
CORRECT ANSWER = W0 = 1/Lc
6 :- calculate the work done if a force of 10N applied at an angle of 30 0 to the horizontal moves the body through a distance of 0.05m
CORRECT ANSWER = 0.25 {3 J
7 :- the expression for electric potential (V) is
CORRECT ANSWER = (q / 4Er)
7 :- the expression for electric potential (V) is
CORRECT ANSWER = (q / 4Er)
8 :- a solid weighs 10.5N in air and weighs 5.5N when immersed in a liquid of density 900kgm-3, calculate the volume of the solid
CORRECT ANSWER = 5.56 x 10 -4 m 3
8 :- a solid weighs 10.5N in air and weighs 5.5N when immersed in a liquid of density 900kgm-3, calculate the volume of the solid
CORRECT ANSWER = 5.56 x 10 -4 m 3
9 :- during dispersion, colours of light
CORRECT ANSWER = travel at different speeds
10 :- cobvert 180 0F to 0C
CORRECT ANSWER = 82 0C
11 :- the bean balance is used to measure
CORRECT ANSWER = mass
12 :- the diagram above represents four identical beaker of water with some droplet of a blue colour pigment. Which of them will have a faster rate of diffusion?
CORRECT ANSWER = beaker IV
12 :- the diagram above represents four identical beaker of water with some droplet of a blue colour pigment. Which of them will have a faster rate of diffusion?
CORRECT ANSWER = beaker IV
13 :- a thick glass tumbler cracks when hot water is pour into it because of
CORRECT ANSWER = uneven expansion
14 :- the point M in the diagram above is in stable equilibrium with
CORRECT ANSWER = minimum potention energy
15 :- the charge stored by a 5F capacitor connected to a potential difference of 40V is
CORRECT ANSWER = 200C
16 :- the dissociation of salt solution and acids into ions is known as
CORRECT ANSWER = electroysis
17 :- the resultant of two parallel forces acting in the same direction applied to a block of wood will be
CORRECT ANSWER = maximum
18 :- from the above the induced e.m.f depends on
CORRECT ANSWER = I, II and III
19 :- how much current does a 120W light bulb draw when connected to a voltage of 240?
CORRECT ANSWER = 0.5A
20 :- from the above diagram the effective resistance between P and Q is
CORRECT ANSWER = 4.33n
21 :- a semi-conductor with rqual numver of holes and electron is known as
CORRECT ANSWER = intrinsic semi-conductor
22 :- which of the following is CORRECT about the motion of a simple pendulum?
CORRECT ANSWER = potention energy is maximum at the extremes
23 :- in the vibration of stretched strings, the frequency F and the tension T are related by
CORRECT ANSWER = f & square root T)
24 :- from the diagram above, the pressure acting on the trapped air is
CORRECT ANSWER = H mmHg
25 :- light energy E is expressed as
CORRECT ANSWER = E = hf
26 :- the ejection of electron from the surface of a
CORRECT ANSWER = thermianic emission
27 :- where does refraction take place?
CORRECT ANSWER = at the boundary between
28 :- ten 6V cells connected in parallel will give an effective e.m.f of
CORRECT ANSWER = 6V
29 :- vavpour is said to be saturated when
CORRECT ANSWER = in a dynamic equilibrium
30 :- a lagged calculator is suitable for measuring heat energy because it
CORRECT ANSWER = prevents heat loss and gain
31 :- a wire carries a current of 3.0A with a magnetic field 2.0T at an angle of 30 0. calculate the force on a segment of wire 0.5m
CORRECT ANSWER = 1.5N
32 :- which method of heat transfer is electro-mamgnetic in nature?
CORRECT ANSWER = radiation
33 :- a light of 6.22eV is incident on a cadmium surface. If a stopping voltage of 2.15eV is required to reduce the photocurrent to zero, calculate the work function of cadmium
CORRECT ANSWER =
34 :- from the digram above, calculate F
CORRECT ANSWER = 60.00N
35 :- which of the folowing exhibits a wave motion?
CORRECT ANSWER = a plucked stretched s tring
36 :- a stone weighs W1 Newton in air W2 Newton in water. The relative density of the stone is
CORRECT ANSWER = W1/(W1-W2)
37 :- why do pressure pots cook food faster than other conventional pots?
CORRECT ANSWER = its higher pressure
38 :- a spring of length 0.06m is acted upon by a force of 2N creating an extension of 0.02m. What would be the length when the applied force is increased by 8N?
CORRECT ANSWER = 0.14m
39 :- when a bar magnet is suspended freely in the earth’s magnetic field, it will point to
CORRECT ANSWER = north – south direction
40 :- the point where a ball moving in a viscous liquid start to move with uniform velocity is
CORRECT ANSWER = terminal velocity

*JAMB CHEMISTRY TRIAL QUESTIONS AND ANSWERS*
*BY OLANREWAJU VALENTINE

*FOR 2020 JAMB RUNZ MESSAGE US ON WHATSAPP:* 08060385217

1)Reduction of alkenones with LiAlH4 produces

Options
A) primary alkanols

*B) secondary alkanols*

C) tertiary alkanols

Explanation:
Reduction of alkenones with Lilah
4
 produces secondary alkanols. Lithium aluminum hydride, Lilah
4
, also abbreviated as LAH, is a reducing agent commonly employed in modern organic synthesis.
Note that alcohols or alkanols are the compounds containing one or more hydroxyl groups (-OH). The alcohols contain the -OH group attached to an alkyl group. In secondary alkanols, the hydrogen group is attached to a secondary carbon atom.

2)The product obtained when a mixture of benzene vapor and hydrogen are passed over a nickel catalyst at 180°C is

Options
*A) cyclohexane*

B) cyclopentane

C) n-hexane

D) n-pentane

D) polyhydric alkanols

3)Polyvinyl chloride is used in the production of

Options
A) glass

B) alloy

*C) pipes*

D) ceramics

4)Detergents are manufactured with straight hydrocarbon chains so as to make them

Options
A) soluble

*B) biodegradable*

C) cheaper

D) foamy

5)A mixture of sugar and sulfur can be separated by

Options
A) dissolution in water, evaporation, and filtration

B) filtration, evaporation and dissolution in water

*C) dissolution in water, filtration, and evaporation*

D) evaporation, dissolution in water and filtration

Explanation:
Sulfur is insoluble in water. Sugar will dissolve in water to form a homogeneous solution which will pass through filter paper. After filtration, sugar can be gotten by evaporation to dryness


6)Which of the following is a physical change?

Options
*A) Freezing ice cream*

B) dissolving calcium in the water

C) burning kerosene

D) Exposing white phosphorus to air

7)The percentage of water of crystallization in ZnSO4.7H2O is
[Zn = 65, S = 32, O = 1, H = 1]

Options
A) 33%

*B) 44%*

C) 55%

D) 87%

Explanation:
Molecular mass of ZnSO4.7H20
Add the molar masses:
65 + 32 + 16
× 4 + 7(18) = 287
The mass of water of crystallisation = 126
126/287 × 100/1 = 12600/287

= 44%

8)0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 moles of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm3]

Options
A) 224cm3

*B) 168cm3*

C) 112cm3

D) 100cm3
Explanation:
CaCO3 + 2HCl
 CaCl2 + CO2 + H20
1 mole of CaCO3 = 22.4dm3
0.0075mole of CaCO3 = 0.0075
×
 22.4
= 0.168dm3 = 168cm3


9)A gas exerts pressure on its container because

Options
*A) the molecules of gas collide with the walls of the container*

B) some of the molecules are moving faster than others

C) of the collisions of the molecules with each other

D) of the mass of the molecules of the gas

10)The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the

Options
A) forces of attraction and repulsion are in equilibrium

B) gaseous molecules can occupy any available space

*C) gaseous molecules will continue their motion indefinitely*

D) gases can be compressed


11)If an atom is represented as cf
23X
11
, which of the following deductions is correct?

Options
A) It contains 12 protons.

B) It forms a covalent chloride.

C) Its atomic number is 23.

*D) It is an alkali metal.*

12)Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays

Options
A) are positively charged

B) are negatively charged

C) have mass

*D) travel in straight lines*

13)Which quantum number divides shells into orbitals?

Options
A) principal

*B) Azimuthal *

C) Magnetic

D) Spin

Explanation:
An azimuthal quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital.

14)The type of bonding in {Cu(NH3)4}2+ is

Options
*A) coordinate*

B) electrovalent

C) metallic

D) covalent

Explanation:
The type of bonding here is a coordinate bond. In the formation of a simple covalent bond, each atom supplies one electron to the bond - but that doesn't have to be the case. A co-ordinate bond (also called a dative covalent bond) is a covalent bond (a shared pair of electrons) in which both electrons come from the same atom.

15)The mixture of gases used in a photographer's flash tube is

Options
A) argon and krypton

*B) krypton and xenon*

C) helium and argon

D) argon and xenon

*EXPLANATION:*
 A flash tube also called a flashlamp, is an electric arc lamp designed to produce extremely intense, incoherent, full-spectrum white light for very short durations. Flashtubes are made of a length of glass tubing with electrodes at either end and are filled with a gas that, when triggered, ionizes and conducts a high voltage pulse to produce the light. Flashtubes are used mostly for photographic purposes but are also employed in scientific, medical, industrial, and entertainment applications.

As with all ionized gases, xenon flash tubes emit light in various spectral lines. This is the same phenomenon that gives neon signs their characteristic color. Due to its high-efficient, white output, xenon is used extensively for photographic applications, despite its great expense. Krypton is also used in photographic flash tubes and can be as good as 40% efficient, but requires up to a 70% increase in pressure over xenon to achieve a more efficient flash.

16) When sodium trioxocarbonate (IV) decahydrate loses its water of crystallization to the atmosphere, the process is

Options
A) deliquescence

*B) efflorescence*

C) hygroscopic

D) effervescence


Explanation:
Efflorescence (which means "to flower out" in French) is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process involves the dissolving of an internally held salt in water, or occasionally in another solvent.

Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from that release. The word effervescence is derived from the Latin verb fervere (to boil), preceded by the adverb ex. It has the same linguistic root as the word fermentation. Effervescence can also be observed when opening a bottle of champagne, beer or carbonated beverages such as soft drinks. The visible bubbles are produced by the escape from a solution of the dissolved gas (which itself is not visible while dissolved in the liquid).

Hygroscopy is the phenomenon of attracting and holding water molecules from the surrounding environment, which is usually at normal or room temperature. This is achieved through either absorption or adsorption with the adsorbing substance becoming physically changed somewhat.

Deliquescence, like hygroscopy, is also characterized by a strong affinity for water and a tendency to absorb moisture from the atmosphere if exposed to it. Unlike hygroscopy, however, deliquescence involves absorbing sufficient water to form an aqueous solution.

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17)Water can be obtained as the only product during the

Options
A) combustion of hydrocarbons

B) neutralization of an acid by a base

*C) combustion of hydrogen*

D) electrolysis of brine

Explanation:
Water is the anhydride of hydrogen in terms of composition, 2H2(g)+O2(g) = 2H20.

18)If 10.5g of lead (II) trinitrate (V) is dissolved in 20cm3 of distilled water at 18°C, the solubility of the solute in mol dm-3 is
[Pb = 207, N = 14, O = 16]

Options
*A) 1.60*

B) 5.25

C) 16.00

D) 525.00

Explanation:
Mass of Pb(NO3)2=10.5g
Volume of distilled water = 20cm³

By calculating the number of moles of lead trioxonitrate
Number of a mole of Pb(NO3)2= Mass/Molar Mass

But molar mass of Pb(NO3)2
 = 207+2(14+(16×3)=331

Therefore, number of moles = 10.5/331=0.032mole
The solubility of lead trioxonitrate =
number of moles of lead trioxonitrate
The volume of distilled water
 multiplied by 1000 cm3

i.e.
0.032/20×1000=1.60

19)For a given solute, the concentration of its saturated solution in different solvents are

Options
A) the same at the same temperature

*B) different at the same temperature*

C) the same at different temperature

D) constant

20)The major source of oxides of nitrogen is from the burning of

Options
A) coal

B) wood

*C) fuel*

D) chlorofluorocarbons

Explanation:
Nitrogen oxides form when fuel is burned at high temperatures.

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