# Ionic Equilibrium Test 2

Total Questions:50 Total Time: 75 Min

Remaining:

## Questions 1 of 50

Question:Lewis acid

Presence of H atom is necessary

Is a electron pair donor

Always a proton donor

Is a electron pair acceptor

## Questions 2 of 50

Question:For two acids A and $$B,\,\,p{K_a} = 1.2,\,\,p{K_b} = 2.8$$ respectively in value, then which is true

A and B both are equally acidic

A is stronger than B

B is stronger than A

Neither A nor B is strong

None of these

## Questions 3 of 50

Question:Which of the following dissolves in water to give a neutral solution

$${(N{H_4})_2}S{O_4}$$

$$Ba{(N{O_3})_2}$$

$$CrC{l_3}$$

$$CuS{O_4}$$

## Questions 4 of 50

Question:The aqueous solution of disodium hydrogen phosphate is

Acidic

Neutral

Basic

None

## Questions 5 of 50

Question:In the reaction $$SnC{l_2} + 2C{l^ - } \to SnC{l_4},$$ Lewis acid is

$$SnC{l_2}$$

$$C{l^ - }$$

$$SnC{l_4}$$

None of these

## Questions 6 of 50

Question:In the reaction $${I_2} + {I^ - } \to \,{I_3}^ - ,$$ the Lewis base is

$${I_2}$$

$${I^ - }$$

$${I_3}^ -$$

None of these

## Questions 7 of 50

Question:The correct order of acid strength is

$$HClO < HCl{O_2} < HCl{O_3} < HCl{O_4}$$

$$HCl{O_4} < HClO < HCl{O_2} < HCl{O_3}$$

$$HCl{O_2} < HCl{O_3} < HCl{O_4} < HClO$$

$$HCl{O_4} < HCl{O_3} < HCl{O_2}$$$$< HClO$$

## Questions 8 of 50

Question:Which of the following is Lewis acid

$$B{F_3}$$

$$C{l^ - }$$

$${H_2}O$$

$$N{H_3}$$

## Questions 9 of 50

Question:$$p{K_a}$$value of the strongest acid among the following is

3

4.5

1

2

## Questions 10 of 50

Question:Which of the following is not used as a Lewis acid

$$SnC{l_4}$$

$$FeC{l_3}$$

$$KCl$$

$$B{F_3}$$

## Questions 11 of 50

Question:Which of the following can give base $$O{H^ - }$$

$${H_2}O$$

$${H_3}{O^ + }$$

$${H_2}$$

$$HCl$$

## Questions 12 of 50

Question:The expression for the solubility product of $$A{l_2}\,{(S{O_4})_3}$$is

$${K_{sp}} = [A{l^{3 + }}]\,\,(SO_4^{2 - }]$$

$${K_{sp}} = {[A{l^{3 + }}]^2}\,\,{(SO_4^{2 - }]^3}$$

$${K_{sp}} = {[A{l^{3 + }}]^3}\,\,{(SO_4^{2 - }]^2}$$

$${K_{sp}} = {[A{l^{3 + }}]^2}\,\,{(SO_4^{2 - }]^2}$$

## Questions 13 of 50

Question:The aqueous solution of $$FeC{l_3}$$ is acidic due to

Acidic impurities

Ionisation

Hydrolysis

Dissociation

## Questions 14 of 50

Question:Which will not be hydrolysed

Potassium nitrate

Potassium cyanide

Potassium succinate

Potassium carbonate

## Questions 15 of 50

Question:At $${20^o}C,$$ the $$A{g^ + }$$ion concentration in a saturated solution of $$A{g_2}Cr{O_4}$$ is$$1.5 \times {10^{ - 4}}\,mole/litre.$$ At $${20^o}C,$$the solubility product of $$A{g_2}Cr{O_4}$$ would be

$$3.3750 \times {10^{ - 12}}$$

$$1.6875 \times {10^{ - 10}}$$

$$1.6875 \times {10^{ - 12}}$$

$$1.6875 \times {10^{ - 11}}$$

## Questions 16 of 50

Question:If solubility of calcium hydroxide is $$\sqrt 3$$, then its solubility product will be

27

3

9

$$12\sqrt 3$$

## Questions 17 of 50

Question:What is the minimum concentration of $$SO_4^{2 - }$$ required to precipitate $$BaS{O_4}$$ in a solution containing $$1.0 \times {10^{ - 4}}mol\,\,\,B{a^{2 + }}$$? ($${K_{sp}}$$for $$BaS{O_4}$$ is $$4 \times {10^{ - 10}}$$)

$$4 \times {10^{ - 10}}M$$

$$2 \times {10^{ - 7}}M$$

$$4 \times {10^{ - 6}}M$$

$$2 \times {10^{ - 3}}M$$

## Questions 18 of 50

Question:Solubility of a salt $${M_2}{X_3}$$ is $$y\,\,mol\,d{m^{ - 3}}.$$ The solubility product of the salt will be

$$6{y^4}$$

$$64{y^4}$$

$$36{y^5}$$

$$108{y^5}$$

## Questions 19 of 50

Question:The solubility product of a sparingly soluble salt $$A{X_2}$$is $$3.2 \times {10^{ - 11}}$$. Its solubility (in moles / litres) is

$$2 \times {10^{ - 4}}$$

$$4 \times {10^{ - 4}}$$

$$5.6 \times {10^{ - 6}}$$

$$3.1 \times {10^{ - 4}}$$

## Questions 20 of 50

Question:0.5 M ammonium benzoate is hydrolysed to 0.25 percent, hence its hydrolysis constant is

$$2.5 \times {10^{ - 5}}$$

$$1.5 \times {10^{ - 4}}$$

$$3.125 \times {10^{ - 6}}$$

$$6.25 \times {10^{ - 4}}$$

## Questions 21 of 50

Question:An ionizing solvent has

Low value of dielectric constant

High value of dielectric constant

A dielectric constant equal to 1

Has a high melting point

## Questions 22 of 50

Question:The extent of ionization increases

With the increase in concentration of solute

On addition of excess water to solution

On decreasing the temperature of solution

On stirring the solution vigorously

## Questions 23 of 50

Question:Which of the following substance is an electrolyte

Chloroform

Benzene

Toluene

Magnesium chloride

## Questions 24 of 50

Question:In weak electrolytic solution, degree of ionization

Will be proportional to dilution

Will be proportional to concentration of electrolyte

Will be proportional to the square root of dilution

Will be reciprocal to the dilution

## Questions 25 of 50

Question:The $$pH$$of water at $${25^o}C$$ is nearly

2

7

10

12

## Questions 26 of 50

Question:$$pH$$ of a solution is 5. Its hydroxyl ion concentration is

5

10

$${10^{ - 5}}$$

$${10^{ - 9}}$$

## Questions 27 of 50

Question:Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both mixed then resultant pH of the solution will be

3.2

1.9

3.4

3.5

## Questions 28 of 50

Question:On adding solid potassium cyanide to water

pH will increase

pH will decrease

pH will not change

Electrical conductance will not change

## Questions 29 of 50

Question:Components of buffer solution are $$0.1\,M\,HCN$$ and $$0.2\,M\,NaCN$$. What is the pH of the solution

9.61

6.15

2

4.2

## Questions 30 of 50

Question:pH of a solution of $$10\,ml$$. 1N sodium acetate and $$50\,ml$$ 2N acetic acid $$({K_a} = 1.8 \times {10^{ - 5}}),$$ is approximately

4

5

6

7

## Questions 31 of 50

Question:pH of completely dissociated $$0.005\,M\,{H_2}S{O_4}$$ is

3

4

2

5

## Questions 32 of 50

Question:The $$p{K_a}$$ of a weak acid is 4.8. What should be the ratio of [Acid]/[Salt] of a buffer if $$pH = 5.8$$ is required

10

0.1

1

2

## Questions 33 of 50

Question:Which of the following mixtures forms an acid buffer

$$NaOH + HCl$$

$$C{H_3}COOH + C{H_3}COONa$$

$$N{H_4}OH + N{H_4}Cl$$

$${H_2}C{O_3} + {(N{H_4})_2}C{O_3}$$

## Questions 34 of 50

Question:A buffer solution has equal volumes of $$0.2M\,N{H_4}OH$$ and $$0.02M\,N{H_4}Cl$$. The $$p{K_b}$$ of the base is 5. The pH is

10

9

4

7

## Questions 35 of 50

Question:The defination of $$pH$$is

$$pH = \log \frac{1}{{[{H^ + }]}}$$

$$pH = \log \,[{H^ + }]$$

$$pH = - \log \frac{1}{{[{H^ + }]}}$$

$$pH = - {\log ^{[{H^ + }]}}$$

## Questions 36 of 50

Question:Which of the following does not make any change in $$pH$$ when added to $$10\,\,ml$$ dilute $$HCl$$

5 ml pure water

20 ml pure water

10 $$ml\,\,HCl$$

Same 20 $$ml$$dilute $$HCl$$

## Questions 37 of 50

Question:How much sodium acetate should be added to a $$0.1\,\,m$$ solution of $$C{H_3}COOH$$ to give a solution of $$pH = 5.5\,(p{K_a}$$ of $$C{H_3}COOH = 4.5)$$

$$0.1\,\,m$$

$$0.2\,\,m$$

$$1.0\,\,m$$

$$10.0\,\,m$$

## Questions 38 of 50

Question:The $$pH$$ of the aqueous solution containing $$0.49\,\,gm$$of $${H_2}S{O_4}$$ in one litre is

2

1

1.7

0.3

## Questions 39 of 50

Question:If the $$pH$$ of a solution is 4.0 at $${25^o}C,$$ its $$pOH$$ would be $$({K_w} = {10^{ - 14}})$$

4

6

8

10

## Questions 40 of 50

Question:An aqueous solution whose $$O{H^ - }$$ is

Alkaline

Acidic

Neutral

Amphoteric

## Questions 41 of 50

Question:The $$pH$$ of $$\frac{N}{{100}}$$HCl would be approximately

1

1.5

2

2.5

## Questions 42 of 50

Question:A solution which is resistant to change of $$HF$$ upon the addition of an acid or a base is known as

A colloid

A crystalloid

A buffer

An indicator

## Questions 43 of 50

Question:At $$25^\circ C$$ the $$pH$$ value of a solution is 6. The solution is

Basic

Acidic

Neutral

Both1,2

## Questions 44 of 50

Question:A certain buffer solution contains equal concentration of $${X^ - }$$ and $$HX$$. The $${K_a}$$ for HX is $${10^{ - 8}}$$. The $$pH$$ of the buffer is

3

8

11

14

## Questions 45 of 50

Question:$$pH$$of a 10 $$M$$ solution of $$HCl$$ is

Less than 0

2

0

1

## Questions 46 of 50

Question:The $$pH$$ of $$1\,\,N\,\,{H_2}O$$ is

7

>7

<7

0

## Questions 47 of 50

Question:The pH of normal KOH is

1

0

14

7

## Questions 48 of 50

Question:The concentration of hydrogen ion $$[{H^ + }]$$ in 0.01 M $$HCl$$ is

$${10^{12}}$$

$${10^{ - 2}}$$

$${10^{ - 1}}$$

$${10^{ - 12}}$$

## Questions 49 of 50

Question:A buffer solution can be prepared from a mixture of

Sodium acetate and acetic acid in water

Sodium acetate and hydrochloric acid in water

Ammonia and ammonium chloride in water

Ammonia and sodium hydroxide in water

## Questions 50 of 50

Question:Which of the following will not function as a buffer solution

$$NaCl$$ and $$NaOH$$
$$NaOH$$ and $$N{H_4}OH$$
$$C{H_3}COON{H_4}$$ and $$HCl$$