Ionic Equilibrium Set-1

Question 1

Which of the following acts as both a Bronsted acid and a Bronsted base?

Accepted Answer

$HCO_3^-$

Answer

$CO_3^{2-}$

Answer

$NH_4^+$

Answer

$PO_4^{3-}$

Question 2

What is the conjugate base of $H_2PO_4^-$?

Accepted Answer

$HPO_4^{2-}$

Answer

$H_3PO_4$

Answer

$P_2O_5$

Answer

$PO_4^{3-}$

Question 3

The pH of a $1.0 	imes 10^{-8}$ M solution of $HCl$ is:

Accepted Answer

Between 6 and 7

Answer

8.0

Answer

6.0

Answer

Between 7 and 8

Question 4

According to the Lewis concept, an acid is a/an:

Accepted Answer

Electron pair acceptor

Answer

Proton donor

Answer

Electron pair donor

Answer

Hydroxyl ion donor

Question 5

For a neutral solution at $373$ K, where $K_w = 5.13 	imes 10^{-13}$, the pH is:

Accepted Answer

6.14

Answer

7.00

Answer

12.28

Answer

6.50

Question 6

Which of the following salts will undergo anionic hydrolysis?

Accepted Answer

$CH_3COONa$

Answer

$NaCl$

Answer

$NH_4Cl$

Answer

$CuSO_4$

Question 7

If the degree of ionization ($\alpha$) of a weak electrolyte is very small, Ostwald’s Dilution Law is expressed as:

Accepted Answer

$K_a = C\alpha^2$

Answer

$K_a = C\alpha$

Answer

$K_a = C/\alpha^2$

Answer

$K_a = \alpha^2/C$

Question 8

A buffer solution is a mixture of:

Accepted Answer

Weak acid and its conjugate base

Answer

Strong acid and its conjugate base

Answer

Strong base and its conjugate acid

Answer

Two strong acids

Question 9

The solubility of $AgCl$ will be minimum in:

Accepted Answer

$0.1$ M $CaCl_2$

Answer

Pure water

Answer

$0.1$ M $AgNO_3$

Answer

$0.1$ M $NaCl$

Question 10

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

Accepted Answer

12

Answer

2

Answer

10

Answer

7

Question 11

Which is the strongest conjugate base?

Accepted Answer

$CH_3COO^-$

Answer

$Cl^-$

Answer

$NO_3^-$

Answer

$HSO_4^-$

Question 12

The relationship between $K_a$ and $K_b$ for a conjugate acid-base pair is:

Accepted Answer

$K_a 	imes K_b = K_w$

Answer

$K_a + K_b = K_w$

Answer

$K_a / K_b = K_w$

Answer

$K_a 	imes K_w = K_b$

Question 13

The pH of a buffer solution containing equal concentrations of $CH_3COOH$ ($K_a = 1.8 	imes 10^{-5}$) and $CH_3COONa$ is:

Accepted Answer

4.74

Answer

7.00

Answer

9.26

Answer

5.00

Question 14

For the salt $A_2B_3$, the expression for the solubility product ($K_{sp}$) in terms of solubility ($S$) is:

Accepted Answer

$108S^5$

Answer

$6S^5$

Answer

$36S^5$

Answer

$25S^4$

Question 15

When $HCl$ gas is passed through a saturated solution of $NaCl$, the $NaCl$ precipitates because:

Accepted Answer

Ionic product of $[Na^+][Cl^-]$ exceeds $K_{sp}$

Answer

$HCl$ is a gas

Answer

$K_{sp}$ of $NaCl$ decreases

Answer

$HCl$ reacts with $NaCl$

Question 16

Which of the following is a polyprotic acid?

Accepted Answer

$H_3PO_4$

Answer

$HCl$

Answer

$CH_3COOH$

Answer

$HNO_3$

Question 17

The $pOH$ of a solution is 5.4. The solution is:

Accepted Answer

Basic

Answer

Acidic

Answer

Neutral

Answer

Highly Basic

Question 18

Which species acts as a Lewis base in the reaction $BF_3 + :NH_3 \rightarrow F_3B \leftarrow NH_3$?

Accepted Answer

$NH_3$

Answer

$BF_3$

Answer

Both

Answer

None

Question 19

In the reaction $H_2O + HCl \rightleftharpoons H_3O^+ + Cl^-$, $H_2O$ acts as:

Accepted Answer

Bronsted Base

Answer

Bronsted Acid

Answer

Lewis Acid

Answer

Neutral solvent only

Question 20

The hydrolysis constant ($K_h$) for a salt of a weak acid and strong base is:

Accepted Answer

$K_h = K_w / K_a$

Answer

$K_h = K_w / K_b$

Answer

$K_h = K_w / (K_a \cdot K_b)$

Answer

$K_h = K_a \cdot K_b$

Question 21

A solution has $[OH^-] = 10^{-5}$ M. Its pH will be:

Accepted Answer

9

Answer

5

Answer

7

Answer

14

Question 22

Which of the following will not change the pH of water upon addition?

Accepted Answer

$NaCl$

Answer

$NH_4Cl$

Answer

$Na_2CO_3$

Answer

$CH_3COONH_4$

Question 23

The solubility product of $BaSO_4$ is $1.1 	imes 10^{-10}$. Its solubility in mol/L is:

Accepted Answer

$1.05 	imes 10^{-5}$

Answer

$1.1 	imes 10^{-5}$

Answer

$1.21 	imes 10^{-20}$

Answer

$0.55 	imes 10^{-10}$

Question 24

Degree of dissociation of a weak acid $HA$ is $0.1$ in $0.1$ M solution. The $K_a$ is:

Accepted Answer

$10^{-3}$

Answer

$10^{-2}$

Answer

$10^{-4}$

Answer

$0.1$

Question 25

In which of the following, the solubility product is not applicable?

Accepted Answer

$NaCl$

Answer

$AgCl$

Answer

$PbSO_4$

Answer

$Fe(OH)_3$

Question 26

If $K_a$ for $CH_3COOH$ is $1.8 	imes 10^{-5}$, what is the $K_b$ for $CH_3COO^-$?

Accepted Answer

$5.55 	imes 10^{-10}$

Answer

$1.8 	imes 10^{-9}$

Answer

$1.0 	imes 10^{-14}$

Answer

$5.55 	imes 10^{-5}$

Question 27

A buffer solution cannot be prepared by mixing:

Accepted Answer

$HCl + NaCl$

Answer

$CH_3COOH + CH_3COONa$

Answer

$NH_4OH + NH_4Cl$

Answer

$H_3PO_4 + NaH_2PO_4$

Question 28

The pH of $0.1$ M $CH_3COONH_4$ ($pK_a = pK_b = 4.75$) is:

Accepted Answer

7.00

Answer

4.75

Answer

9.25

Answer

14.00

Question 29

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

Accepted Answer

Decreases

Answer

Increases

Answer

Remains same

Answer

Becomes 7

Question 30

Solubility of $M(OH)_2$ is $10^{-4}$ mol/L. Its $K_{sp}$ is:

Accepted Answer

$4 	imes 10^{-12}$

Answer

$10^{-8}$

Answer

$10^{-12}$

Answer

$4 	imes 10^{-8}$

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Ionic Equilibrium Set-1

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