Chemical Equilibrium Set-1

Question 1

For the reversible reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$, the relationship between $K_p$ and $K_c$ is:

Accepted Answer

$K_p = K_c(RT)^{-2}$

Answer

$K_p = K_c(RT)^{2}$

Answer

$K_p = K_c(RT)^{-1}$

Answer

$K_p = K_c(RT)^{1}$

Question 2

In which of the following reactions does the equilibrium remain unaffected by a change in pressure?

Accepted Answer

$N_2(g) + O_2(g) \rightleftharpoons 2NO(g)$

Answer

$PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$

Answer

$N_2O_4(g) \rightleftharpoons 2NO_2(g)$

Answer

$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$

Question 3

According to Le Chatelier’s principle, adding heat to an exothermic reaction in equilibrium will:

Accepted Answer

Shift the equilibrium to the left

Answer

Shift the equilibrium to the right

Answer

Have no effect on the equilibrium

Answer

Increase the value of $K_c$

Question 4

What is the unit of $K_p$ for the reaction: $CaCO_3(s) \rightleftharpoons CaO(s) + CO_2(g)$?

Accepted Answer

$atm$

Answer

$atm^2$

Answer

$atm^{-1}$

Answer

Unitless

Question 5

The pH of a $10^{-8} M$ $HCl$ solution is:

Accepted Answer

Between 6 and 7

Answer

8

Answer

7

Answer

Between 7 and 8

Question 6

Which of the following is a Lewis acid?

Accepted Answer

$BF_3$

Answer

$NH_3$

Answer

$H_2O$

Answer

$OH^-$

Question 7

If the solubility product of $AgCl$ is $1.8 	imes 10^{-10}$, its solubility in water is:

Accepted Answer

$1.34 	imes 10^{-5} mol/L$

Answer

$1.8 	imes 10^{-5} mol/L$

Answer

$0.9 	imes 10^{-10} mol/L$

Answer

$3.6 	imes 10^{-10} mol/L$

Question 8

A buffer solution can be prepared by mixing:

Accepted Answer

Weak acid and its salt with strong base

Answer

Strong acid and its salt with strong base

Answer

Strong base and its salt with strong acid

Answer

Pure water and any salt

Question 9

If the equilibrium constant for $A + B \rightleftharpoons C$ is $K$, what is the equilibrium constant for $2C \rightleftharpoons 2A + 2B$?

Accepted Answer

$\frac{1}{K^2}$

Answer

$2K$

Answer

$K^2$

Answer

$\sqrt{K}$

Question 10

The conjugate base of $H_2PO_4^-$ is:

Accepted Answer

$HPO_4^{2-}$

Answer

$H_3PO_4$

Answer

$PO_4^{3-}$

Answer

$H_4PO_4$

Question 11

At $298 K$, the $pH + pOH$ of any aqueous solution is always:

Accepted Answer

14

Answer

0

Answer

7

Answer

Dependent on concentration

Question 12

If $Q_c < K_c$ for a reaction, the reaction will:

Accepted Answer

Proceed in the forward direction

Answer

Proceed in the backward direction

Answer

Be at equilibrium

Answer

Stop immediately

Question 13

Which factor will change the value of the equilibrium constant $K$?

Accepted Answer

Change in temperature

Answer

Change in pressure

Answer

Change in concentration

Answer

Presence of a catalyst

Question 14

For the reaction $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$, if the volume of the container is doubled, the equilibrium constant will:

Accepted Answer

Remain unchanged

Answer

Double

Answer

Halve

Answer

Quadruple

Question 15

The degree of dissociation of a weak electrolyte increases with:

Accepted Answer

Dilution

Answer

Increase in concentration

Answer

Decrease in temperature

Answer

Addition of a common ion

Question 16

Which of the following salts will undergo anionic hydrolysis?

Accepted Answer

$CH_3COONa$

Answer

$NaCl$

Answer

$NH_4Cl$

Answer

$CuSO_4$

Question 17

The ionic product of water ($K_w$) increases with:

Accepted Answer

Increase in temperature

Answer

Increase in pressure

Answer

Decrease in temperature

Answer

Addition of acid

Question 18

What is the $K_{sp}$ expression for $Zr_3(PO_4)_4$?

Accepted Answer

$6912 s^7$

Answer

$108 s^5$

Answer

$144 s^7$

Answer

$s^7$

Question 19

In the reaction $I_2 + I^- \rightleftharpoons I_3^-$, the Lewis base is:

Accepted Answer

$I^-$

Answer

$I_2$

Answer

$I_3^-$

Answer

None

Question 20

Adding an inert gas to the following equilibrium at constant volume: $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$ will:

Accepted Answer

Have no effect

Answer

Shift it to the right

Answer

Shift it to the left

Answer

Increase $NH_3$ yield

Question 21

A solution with $pH = 3$ is diluted 100 times. The new pH will be:

Accepted Answer

5

Answer

1

Answer

3.1

Answer

7

Question 22

Which of the following is NOT a characteristic of chemical equilibrium?

Accepted Answer

The concentration of reactants and products become equal.

Answer

It is dynamic in nature.

Answer

It can be attained from either side.

Answer

Measurable properties like density and color become constant.

Question 23

For the equilibrium $H_2O(l) \rightleftharpoons H_2O(g)$ at $100^\circ C$ and $1 atm$ pressure:

Accepted Answer

$\Delta G = 0$

Answer

$\Delta G > 0$

Answer

$\Delta G < 0$

Answer

$\Delta S = 0$

Question 24

The solubility of $AgCl$ will be minimum in:

Accepted Answer

$0.1 M AgNO_3$

Answer

Pure water

Answer

$0.1 M NaCl$

Answer

$0.01 M CaCl_2$

Question 25

In which case does $K_p = K_c$?

Accepted Answer

$H_2 + I_2 \rightleftharpoons 2HI$

Answer

$N_2 + 3H_2 \rightleftharpoons 2NH_3$

Answer

$PCl_5 \rightleftharpoons PCl_3 + Cl_2$

Answer

$2NO_2 \rightleftharpoons N_2O_4$

Question 26

The pH of a $0.01 M$ $NaOH$ solution is:

Accepted Answer

12

Answer

2

Answer

10

Answer

14

Question 27

If the concentration of $OH^-$ in a solution is $10^{-10} M$, the solution is:

Accepted Answer

Acidic

Answer

Basic

Answer

Neutral

Answer

Buffer

Question 28

Which of the following oxides of nitrogen is most stable at $298 K$ given their $K_c$ for decomposition?

Accepted Answer

$N_2O_4: K_c = 1 	imes 10^{10}$

Answer

$NO: K_c = 1 	imes 10^{30}$

Answer

$N_2O: K_c = 1 	imes 10^{35}$

Answer

$NO_2: K_c = 1 	imes 10^{20}$

Question 29

What happens to the pH of a solution when $NH_4Cl$ is added to $NH_4OH$ solution?

Accepted Answer

Decreases

Answer

Increases

Answer

Remains same

Answer

Becomes 7

Question 30

For the reaction $2A(g) \rightleftharpoons B(g) + Q$ kcal, which conditions favor the yield of B?

Accepted Answer

High pressure, Low temperature

Answer

Low pressure, High temperature

Answer

High pressure, High temperature

Answer

Low pressure, Low temperature

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Chemical Equilibrium Set-1

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