Equilibrium: MCQs | Question – Paper 2


Topic: Equilibrium, Test No.: 02, Total MCQs: 15

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Question 1

In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will [West Bengal JEE 2012]

A

also be doubled

B

be halved

C

remain the same

D

become one-fourth

Question 2

In 1L saturated solution of AgCl[KSP(AgCl) = 1.6 × 10–10], 0.1 mol of CuCl [KSP(CuCl) = 1.0 × 10–6] is added.

The resultant concentration of Ag+ in the solution is 1.6 × 10–x. The value of "x" is. [IIT JEE 2011]

A

7

B

9

C

13

D

15

Question 3

One dm3 solution containing 10–5 moles each of Cl ions and CrO4–2 ions is treated with 10–4 mole of silver nitrate. Which one of the following observations is made? [Karnataka CET 2010]

[KSPAg2CrO4 = 4 × 10–12]                    

[KSP AgCl = 1 × 10–10]

A

Silver chromate gets precipitated first.

B

Precipitation does not occur.

C

Both silver chromate and silver chloride start precipitating simultaneously.

D

Silver chloride gets precipitated first.

Question 4

In aqueous solution the ionisation constants for carbonic acid are

K1 = 4.2 × 10–7 and K2 = 4.8 × 10–11

Select the correct statement for a saturated 0.034 M solution of the carbonic acid. [AIEEE 2010]

A

The concentration of H+ is double that of

B

The concentration of  is 0.034 M

C

The concentration of  is greater than that of

D

The concentrations of H+ and are approximately equal

Question 5
 

Three reactions involving  are given below: [AIEEE 2010]

(i) H3PO4 + H2O H3O+ +

(ii)  + H2O  H3O+

(iii)  + OH H3PO4 + O2+

In which of the above does  act as an acid?

A

(i) only

B

(ii) only

C

(i) and (ii)

D

(iii) only

Question 6

Solubility product of silver bromide is 5.0 × 10–13. The quantity of potassium bromide (molar mass taken as 120 g mol–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is [AIEEE 2010]

A

5.0 × 10–8 g

B

1.2 × 10–10 g

C

1.2 × 10–9 g

D

6.2 × 10–5 g

Question 7

Solid Ba(NO3)2 is gradually dissolved in a
1.0 × 10–4 M Na2CO3 solution. At what concentration of Ba2+ will a precipitate begin to form? [AIEEE 2009]

(Ksp for BaCO3 = 5.1 × 10–9)

A

5.1 × 10–5 M

B

8.1 × 10–8 M

C

8.1 × 10–7 M

D

4.1 × 10–5 M

Question 8

At 25°C, the solubility product of Mg(OH)2 is 1.0 × 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a

solution of 0.001 M Mg2+ ions? [AIEEE 2010]

A

8

B

9

C

10

D

11

Question 9
 

The equilibrium constants for the reactions X  2Y and Z  P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is [AIEEE 2008]

A

1 : 36

B

1 : 1

C

1 : 3

D

1 : 9

Question 10

Three moles of PCl5, three moles of PCl3 and two moles of Cl2 are taken in a closed vessel. If at equilibrium the vessel has 1.5 moles of PCl5, the number of moles of PCl3 present in it is [Karnataka CET 2008]

A

5

B

3

C

6

D

4.5

Question 11
 

For the reaction 2HI(g)  H2(g) + I2(g) – QKJ, the equilibrium constant depends upon [Karnataka CET 2008]

A

temperature

B

pressure

C

catalyst

D

volume

Question 12

N2 + 3H2  2NH3 + heat.

What is the effect of the increase of temperature on the equilibrium of the reaction? [Karnataka CET 2008]

A

equilibrium is shifted to the left

B

equilibrium is shifted to the right

C

equilibrium is unaltered

D

reaction rate does not change

Question 13

Four species are listed below

(i)

(ii) H3O+

(iii)

(iv) HSO3F

Which one of the following is the correct sequence of their acid strength? [AIEEE 2008]

A

iv < ii < iii < i

B

ii < iii < i < iv

C

i < iii < ii < iv

D

iii < i < iv < ii

Question 14

The first and second dissociation constants of an acid H2A are
1.0 × 10−5 and 5.0 × 10−10 respectively.

The overall dissociation constant of the acid will be [AIEEE 2007]

A

5.0 × 10−5

B

5.0 × 1015

C

5.0 × 10−15

D

0.0 × 105

Question 15

Phosphorus pentachloride dissociates as follows, in a closed reaction vessel,
PCl5(g)  PCl3(g) + Cl2(g)

If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the partial pressure of PCl3 will be [AIEEE 2006]

A

B

C

D

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