Solubility Generix Content - Solubility
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JAMB questions for "Chemistry :: Solubility"
Q1

Calculate the solubility in mol-3 of 40g of CuSO4 dissolved in 100g of water at 1200C.

 

[Cu = 64, S = 32, O = 16]

A

0.40

B

0.25

C

4.00

D

2.50

E

Answer: D

Solubility
Q2

Coffee stains can best be removed by 

A

a solution of borax in water

B

ammonia solution

C

kerosine

D

turpentine

E

Answer: A

Solubility
Q3

The acid that is used to remove rust is

A

trioxonitrate (V)

B

tetraoxosulphate (VI)

C

boric

D

hydrochloric

E

Answer: D

Solubility
Q4

Iron can be protected from corrosion by coating the surface with

A

copper

B

zinc

C

gold

D

silver

E

Answer: B

Solubility
Q5
In which of the following is the entropy change positive?
A
Addition of concentrated acid to water
B
Dissolution of sodium metal in water
C
Thermal dissociation of ammonium chloride
D
Reaction between an acid and a base
E

Answer: C

Solubility
Q6

To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) acid confirmed the presence of 

A

SO2-3

B

NO-3

C

CO2-3

D

Cl-

E

Answer: B

Solubility
Q7

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

A

argon and krypton

B

krypton and xenon

C

helium and argon

D

argon and xenon

E

Answer: B

Solubility
Q8

if 10.5g of lead (II) trioxonitrate (V) is dissolved in 20 cm3 of distilled water at 180C, the solubility of the solute in mol-1 dm-3 is

 

[Pb = 207, N = 14, O = 16]

A

1.60

B

2.25

C

16.00

D

525.00

E

Answer: A

Solubility
Q9

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

A

the same at the same temperature 

B

different at the same temperature

C

the same at different temperature

D

constant

E

Answer: B

Solubility
Q10

What volume of 1.5 m solution of KOH would contain 0.045 moles?

A

67.50 cm3

B

30.00 cm3

C

6.75 cm3

D

3.00 cm3

E

Answer: B

Solubility
Q11

The vulcanizer's solution is prepared by dissolving rubber in

A

ethanol

B

kerosine

C

benzene

D

petrol

E

Answer: C

Solubility
Q12

117.0g of sodium chloride was dissolved in 1.0dm3 of distilled water at 250C. Determine the solubility in mol-1 dm-3 of sodium chloride at that temperature.

 

[Na = 23, Cl = 35.5]

A

1.0

B

2.0

C

3.0

D

4.0

E

Answer: B

Solubility
Q13

A supersaturated solution is said to caontain

A

as much solute as it can dissolve at that temperature

B

more solute than it can dissolve at that temperature 

C

as much solute as it can dissolve at that temperature in the presence of undissolved solute

D

as much solute than it can dissolve at that temperature in the presence of undissolved solute

E

Answer: B

Solubility
Q14
When 50cm3 of a saturated solution of sugar of molar mass 342g at 400C was evaporated to dryness, 34.2g of dry solid was obtained, the solubility of sugar at 400C is
A
2.0 mol dm-3
B
3.5 mol dm-3
C
7.0 mol dm-3
D
10.0 mol dm-3
E

Answer: A

Solubility
Q15
When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchanged. This shows that the solution was
A
supersaturated
B
concentrated
C
insaturated
D
saturated
E

Answer: D

Solubility
Q16
Kerosine is commonly used to remove the red colour stain of palm oil from clothes because it
A
helps to spread the oil over a large surface area.
B
makes the oil evaporate easily by dissolving it
C
helps to dilute the oil and reduce its colour
D
reacts with the oil to form an odourless compound
E

Answer: C

Solubility
Q17
The solubility curve shows the variation of solute concentration with
A
volume
B
vapour density
C
pressure
D
temperature
E

Answer: D

Solubility
Q18
Phenolphthalein in acidic solution is 
A
colourless
B
yellow
C
red
D
orange
E

Answer: A

Solubility
Q19
The solubility in mol dm-3 of 20g of CuSO4 dissolved in 100g of water at 1800C is   [Cu = 64, S = 32, O = 16]
A
0.25
B
0.13
C
2.00
D
1.25
E

Answer: D

Solubility
Q20
The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is   [Ag = 108, F = 96500 C mol-1]
A
54.0g
B
27.0g
C
13.5g
D
108.0g
E

Answer: A

Solubility
Q21
The structural components that makes detergent dissolve more quickly in water than soap is 
A
-SO-4 Na+
B
-COO- K+
C
-COO- Na+
D
-SO-3Na+
E

Answer: D

Solubility
Q22
A liquid that will dissolve fat is
A
kerosine
B
hydrochloric acid
C
water
D
calcium hydroxide
E

Answer: D

Solubility
Q23
When 10g of sodium hydroxide is dissolved in 1000cm3 of water, the solution formed is approximately   [Na = 23, H = 1, O = 16]
A
0.50 mol dm-3
B
0.01 mol dm-3
C
0.10 mol dm-3
D
0.25 mol dm-3
E

Answer: C

Solubility
Q24
A change  in the temperature of a saturated solution disturbs the equilibrium between the 
A
solvent and the undissolved solute
B
dissolved solute and the solution
C
dissolved solute and the solvent 
D
dissolved solute and the undissolved solute
E

Answer: A

Solubility
Q25
A rock sample was added to cold dilute HNO3. The gas evolved was passed into a solution of acidified K2Cr2O7 and the solution turned green. The rock sample contains
A
Cl-
B
NO3-
C
SO32-
D
SO42-
E

Answer: C

Solubility
Q26
The solubility of a salt of molar mass of 101g at 200C is 0.34 mol dm-3. If 3.04g of the salt is dissolved completely in 250 cm3 of water in a beaker, the resulting solution is
A
a suspension
B
saturated
C
unsaturated
D
supersaturated
E

Answer: C

Solubility
Q27
Proteins in acid solution undergo
A
polymerization
B
hydrolysis
C
fermentation
D
substitution
E

Answer: B

Solubility
Q28
At what temperature are the solubility of L and K the same?
A
75oC
B
1000C
C
900C
D
820C
E

Answer: D

Solubility
Q29
If 1dm3 of a saturated solution L at 60oC is cooled to 250C, what amount in mole will separate out?
A
0.25
B
0.50
C
0.75
D
1.00
E

Answer: C

Solubility
Q30
Deliquescent substances are used for
A
drying
B
melting
C
wetting
D
cooling
E

Answer: A

Solubility
Q31
Pure solvents are obtained by
A
evaporation
B
extraction
C
condensation
D
distillation
E

Answer: D

Solubility
Q32
The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500 cm of a solution of X is cooled from 600C to 200C.
A
0.750 mole
B
0.950 mole
C
2.375 moles
D
4.750 moles
E

Answer: A

Solubility
Q33
The POH of a solution of 0.25 mol dm-3 of hydrochloric acid is 
A
12.40
B
13.40
C
14.40
D
14.60
E

Answer: B

Solubility
Q34
1.0 dm3 of distilled water was used to wash 2.0g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 x 10-10 mol2 dm-6, what quantity of silver was lost in the process?
A
2.029 x 10-3 mol dm-3
B
1.414 x 10-3 mol dm-3
C
2.029 x 10-5 mol dm-3
D
1.414 x 10-5 mol dm-3
E

Answer: D

Solubility
Q35
Hydration of ions in solution is associated with
A
absorption of heat
B
reduction of heat
C
conduction of heat
D
liberation of heat
E

Answer: A

Solubility
Q36
From the diagram above, the mass of crystals deposited when 1dm3 of a saturated solution of NaCl is cooled from 800C to 600C is    [Na = 23, Cl = 35.5]
A
177.00 g
B
58.50g
C
11.70g
D
5.85g
E

Answer: A

Solubility
Q37
The solution with the lowest pH value is
A
5 ml of M/10 HCl
B
10 ml of M/10 HCl
C
15 ml of M/10 HCl
D
20 ml of M/8 HCl
E

Answer: A

Solubility
Q38
The solubility product of Cu(IO3)2 is 1.08 x 10-7. Assuming that neither ions react appreciably with water to form H+ and OH-, what is the solubility of this salt?
A
2.7 x 10-8 mol dm-3
B
9.0 x 10-8 mol dm-3
C
3.0 x 10-3 mol dm-3
D
9.0 x 10-3 mol dm -3
E

Answer: C

Solubility
Q39
What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?
A
A white precipitate is formed
B
A green precipitate is formed
C
The mixture remains colourless
D
The mixture turns reddish brown
E

Answer: C

Solubility
Q40
0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50dm3. If 15.00 cm3 of the solution requires 12.50cm3 of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution
A
0.30 mol dm-3
B
0.40 mol dm-3
C
0.50 mol dm-3
D
0.60 mol dm-3
E

Answer: A

Solubility
Q41
32g of anhydrous copper (II) tetraoxosulphate (VI) dissolved in 1dm3 of water generated 13.0kJ of heat. The heat of solution is   [Cu = 64, S = 32, O = 16]
A
26.0 kJ mol -1
B
65.0 kJ mol-1
C
130.0 kJ mol-1
D
260.0 kJ mol-1
E

Answer: B

Solubility
Q42
What volume of 0.1 mol dm-3 solution of tetraoxosulphate (VI) acid would be needed to dissolve 2.86g of sodium trioxocarbonate (VI) decahydrate crystals?   [H = 1, C = 12, O = 16, S = 32, Na = 23]
A
20 cm3
B
40 cm3
C
80 cm3
D
100 cm3
E

Answer: D

Solubility
Q43
90.0g of MgCl2 was placed in 500 cm3 of water to give a saturated solution at 298K. If the solubility of the salt is 8.0 mol dm-3 at the same temperature, what is the mass of the salt left undissolved at the given temperature?   [Mg = 24, Cl = 35.5]
A
52.0 g
B
58.5 g
C
85.5 g
D
88.5 g
E

Answer: A

Solubility
Q44
A given amount of gas occupies 10.0dm3 at 4 atm, and 273oC. The number of moles of the gas present is   [Molar volume of gas at s.t.p. = 22.4 dm3]
A
0.89 mol
B
1.90 mol
C
3.80 mol
D
5.70 mol
E

Answer: A

Solubility
Q45
Soap lather is an example of a colloid in which a
A
liquid is dispersed in gas
B
solid is dispersed in liquid
C
gas is dispersed in liquid
D
liquid is dispersed in liquid
E

Answer: C

Solubility
Q46
A saturated solution of AgCl was found to have a concentration of 1.30 x 10-5 mol dm-3. The solubility product of AgCl therefore is
A
1.30 x 10-5 mole2 dm-6
B
1.30 x 10-7 mole2 dm-6
C
1.69 x 10-10 mole2 dm-6
D
2.60 x 10-12 mole2 dm-6
E

Answer: C

Solubility
Q47
A gas sample with an initial volume of 3.25 dm3 is heated and allowed to expand of 3.25 dm3 at constant pressure. What is the ration of the final absolute temperature to the initial absolute temperature?
A
3:1
B
5:2
C
5:4
D
8:3
E

Answer: A

Solubility
Q48
The difference between colliods and suspensions is brought out clearly by the fact that while colloids
A
do not scatter light suspensions do
B
can be separated by filteration, suspensions cannot be so separated
C
can be separated by a membrane, suspensions cannot
D
do not settle out on standing, suspensions do
E

Answer: D

Solubility
Q49
In general, an increase in temperature increases the solubility of a solute in water because
A
more solute molecules collide with each other
B
most solutes dissolves with the evolution of heat
C
more solute molecules dissociate at higher temperatures
D
most solutes dissolve with absorption of heat
E

Answer: C

Solubility
Q50
The densuties of two gases X and Y are 0.5 g dm-3 and 2.0 g dm-3 respectively. What is the rate of diffusion of X relative to Y?
A
0.1
B
0.5
C
2.0
D
4.0
E

Answer: C

Solubility
Q51
Sodium chloride has no solubility product value because of its
A
saline nature
B
high solubility
C
low solubility
D
insolubility
E

Answer: B

Solubility
Q52
The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolved in 100 g of water at room temperature is   [K = 39, O = 16, N = 14]
A
0.10
B
0.20
C
1.00
D
2.00
E

Answer: D

Solubility
Q53
SO3 is NOT directly dissolved in water in the preparation of H2SO4 by the contact process because
A
the reaction between SO3 and water is violently exothermic
B
acid is usually added to water and never water to acid
C
SO3 does not dissolve in water readily
D
SO3 is an acid gas
E

Answer: A

Solubility
Q54
The caustic soda solution in the conical flask serves to
A
dry ethene gas
B
remove carbon (IV) oxide from ethene
C
remove carbon (III) oxide from ethene
D
remove sulphur (IV) oxide from ethene
E

Answer: B

Solubility
Q55
For which salt in the graph above does the solubility increase most  rapidly with rise in temperature?
A
CaSO4
B
KNO3
C
NaCl
D
KCl
E

Answer: B

Solubility
Q56
4.0 g of sodium hydroxide in 250 cm3 of solution contains
A
0.40 mole per dm3
B
0.10 moles per dm3
C
0.04 moles per dm3
D
0.02 moles per dm3
E

Answer: A

Solubility
Q57
An experiment produces gaseous mixture of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be
A
passed over heated copper (II) oxide
B
bubbled through concentrated tetraoxosulphate (VI) acid
C
bubbled through sodium hydroxide solution
D
bubbled through water                                                
E

Answer: C

Solubility
Q58
On which of the following is the solubility of a gaeous substance dependent?   I.    Nature of solventll.   Nature of solutelll.  TemperaturelV.  Pressure
A
l, ll, lll and lV
B
l and ll only
C
ll only
D
l, lll, lV only
E

Answer: D

Solubility
Q59
An emulsion paint consist of
A
gas or liquid particles dispersed in liquid
B
liquid particles dispersed in liquid
C
solid particles dispersed in liquid
D
solid particles dispersed in solid
E

Answer: C

Solubility
Q60
30cm3 of oxygen at 10 atmospheres pressure is placed in a 20 dm3 container. Container. Calculate the new pressure if temperature is kept constant.
A
6.7 atm
B
15.0 atm
C
60.0 atm
D
66.0 atm
E

Answer: B

Solubility