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.
25Common 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.
30The 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
43I 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
54The 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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