Equilibrium: MCQs | Question – Paper 1 2


Topic: Equilibrium, Test No.: 01, Total MCQs: 15

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Question 1

Buffer solutions have constant acidity and alkalinity because [CBSE AIPMT 2012]

A

They have large excess of H+ or OH ions

B

They have fixed value of pH

C

These give unionised acid or base on reaction with added acid or alkali

D

Acids and alkalies in these solutions are shielded from attack by other ions

Question 2

pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product (Ksp) of Ba(OH)2 is [CBSE AIPMT 2012]

A

4.0 × 10–6

B

5.0 × 10–6

C

3.3 × 10–7

D

5.0 × 10–7

Question 3

The solubility of Ca3(PO4)2 in water is y moles/litre. Its solubility product is [West Bengal JEE 2011]

A

6y4

B

36y4

C

64y5

D

108y5

Question 4

Consider the following gaseous equilibria with equilibrium constants K1 and K2 respectively.

SO2(g) +  O2(g)  SO3(g)

2SO3(g)  2SO2(g) + O2(g)

The equilibrium constants are related as ______. [Karnataka CET 2011]

A

B

C

D

Question 5

0.023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is ______. [Karnataka CET 2011]

A

10

B

8

C

9

D

12

Question 6

pH value of which one of the following is NOT equal to one? [Karnataka CET 2011]

A

0.1 M CH3 COOH

B

0.1 M HNO3

C

0.05 M H2SO4

D

50 cm3 0.4 M HCl + 50 cm3 0.2 M NaOH

Question 7

H2S is passed into one dm3 of a solution containing 0.1 mole of Zn2+ and 0.01 mole of Cu2+ till the sulphide ion concentration reaches 8.1 × 10–19 moles. Which one of the following statements is true? [Karnataka CET 2011]

[Ksp of ZnS and CuS are 3 × 10–22 and
8 × 10–36 respectively]

A

Only ZnS precipitates

B

Both CuS and ZnS precipitate

C

Only CuS precipitates

D

No precipitation occurs

Question 8

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is [AIEEE 2011]

A

0.18 atm

B

1.8 atm

C

3 atm

D

0.3 atm

Question 9

What is the best description of the change that occurs when Na2O(s) is dissolved in water? [AIEEE 2011]

A

Oxidation number of oxygen increases

B

Oxidation number of sodium decreases

C

Oxide ion accepts sharing in a pair of electrons

D

Oxide ion donates a pair of electrons

Question 10

An acid HA ionises as

HA   H+ + A

The pH of 1.0 M solution is 5. Its dissociation constant would be [AIEEE 2011]

A

1 × 10–5

B

1 × 10–10

C

5

D

5 × 10–8        

Question 11

Passing H2S gas into a mixture of Mn2+, Ni2+, Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates [IIT JEE 2011]

A

CuS and HgS

B

MnS and CuS

C

MnS and NiS

D

NiS and HgS

Question 12

The Ksp for Cr(OH)3 is 1.6 × 10–30. The molar solubility of this compound in water is : [AIEEE 2011]

A

1.6 × 10–30/27

B

C

D

Question 13

Amines behave as [Karnataka CET 2008]

A

Lewis acids

B

Lewis base

C

aprotic acid

D

neutral compound

Question 14

Hydroxyl ion concentration of 1M HCl is [Karnataka CET 2007]

A

1 × 10–14 mol dm–3

B

1 × 10–1 mol dm–3

C

1 × 10–13 mol dm–3

D

1 × 101 mol dm–3

Question 15

If, in the reaction N2O4  2NO2, x is that part of N2O4 which dissociates, then the number of molecules at equilibrium will be [Karnataka CET 2005]

A

1

B

3

C

(1 + x)

D

(1 + xy)2

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2 thoughts on “Equilibrium: MCQs | Question – Paper 1

  • shreya

    thanks for d MCQs….i got good idea about d questions n answers