# Ionic Equilibrium Test 6

Total Questions:50 Total Time: 75 Min

Remaining:

## Questions 1 of 50

Question:Which one of the following substance has the highest proton affinity

### Answers Choices:

$${H_2}O$$

$${H_2}S$$

$$N{H_3}$$

$$P{H_3}$$

## Questions 2 of 50

Question:Which of the following is the strongest Lewis acid

### Answers Choices:

$$B{I_3}$$

$$BB{r_3}$$

$$BC{l_3}$$

$$B{F_3}$$

## Questions 3 of 50

Question:Accepting the definition that an acid is a proton donor, the acid in the following reaction $$N{H_3} + {H_2}O \to NH_4^ + + O{H^ - }$$ is

### Answers Choices:

$$N{H_3}$$

$${H^ + }$$

$$NH_4^ +$$

$${H_2}O$$

## Questions 4 of 50

Question:With reference to protonic acids, which of the following statements is correct

### Answers Choices:

$$P{H_3}$$is more basic than $$N{H_3}$$

$$P{H_3}$$is less basic than $$N{H_3}$$

$$P{H_3}$$is equally basic as $$N{H_3}$$

$$P{H_3}$$is amphoteric while $$N{H_3}$$ is basic

## Questions 5 of 50

Question:The $$pKa$$for acid A is greater than $$pKa$$ for acid B. The strong acid is

Acid B

Acid A

Both A and B

Neither A nor B

## Questions 6 of 50

Question:The conjugate acid of $$NH_2^ -$$is

### Answers Choices:

$$N{H_3}$$

$$NH_4^ +$$

$$N{H_2}OH$$

$${N_2}{H_4}$$

## Questions 7 of 50

Question:Which of the following is not Lewis acid

### Answers Choices:

$$B{F_3}$$

$$AlC{l_3}$$

$$FeC{l_3}$$

$$P{H_3}$$

## Questions 8 of 50

Question:A solution of sodium acetate in water will

### Answers Choices:

Turn red litmus blue

Turn blue litmus red

Not effect litmus

Decolourises litmus

## Questions 9 of 50

Question:Which of the anhydrous salts when come in contact with water turns blue

Ferrous sulphate

Copper sulphate

Zinc sulphate

Cobalt sulphate

## Questions 10 of 50

Question:The species among the following, which can act as an acid and a base is

### Answers Choices:

$$HSO_4^ -$$

$$SO_4^{2 - }$$

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

$$C{l^ - }$$

## Questions 11 of 50

Question:Among the following acids, the weakest one is

### Answers Choices:

$$HF$$

$$HCl$$

$$HBr$$

$$HI$$

## Questions 12 of 50

Question:An acid is a compound which furnishes (Bronsted-Lowry concept)

### Answers Choices:

An electron

A proton

An electron and a proton

None of the above

## Questions 13 of 50

Question:The indicator used in the titration of iodine against sodium thiosulphate is

### Answers Choices:

Starch

$${K_3}Fe{(CN)_6}$$

$${K_2}Cr{O_4}$$

Potassium

## Questions 14 of 50

Question:Which halide of nitrogen is least basic

### Answers Choices:

$$NB{r_3}$$

$$N{I_3}$$

$$NC{l_3}$$

$$N{F_3}$$

## Questions 15 of 50

Question:Why are strong acids generally used as standard solutions in acid-base titrations

### Answers Choices:

The $$pH$$ at the equivalence point will always be 7

They can be used to titrate both strong and weak bases

Strong acids form more stable solutions than weak acids

The salts of strong acids do not hydrolysed

## Questions 16 of 50

Question:A solution which is $${10^{ - 3}}M$$ each in $$M{n^{2 + }},\,F{e^{2 + }},\,Z{n^{2 + }}$$ and $$H{g^{2 + }}$$ is treated with $${10^{ - 16}}M$$ sulphide ion. If $${K_{sp}}$$ of $$MnS,\,FeS,\,ZnS$$ and $$HgS$$ are $${10^{ - 15}},\,{10^{ - 23}},\,{10^{ - 20}}$$ and $${10^{ - 54}}$$ respectively, which one will precipitate first

### Answers Choices:

$$FeS$$

$$MgS$$

$$HgS$$

$$ZnS$$

## Questions 17 of 50

Question:Aqueous solution of sodium acetate is

Neutral

Weakly acidic

Strongly acidic

Alkaline

## Questions 18 of 50

Question:In absence of formation of complex ions by the addition of a common ion, the solubility of a given salt is

### Answers Choices:

Increased

Decreased

Unaffected

First increased and then decreased

## Questions 19 of 50

Question:On the addition of a solution containing $$Cr{O_4}^{2 - }$$ions to the solution of $$B{a^{2 + }},\,\,S{r^{2 + }}$$ and $$C{a^{2 + }}$$ions, the precipitate obtained first will be of

### Answers Choices:

$$CaCr{O_4}$$

$$SrCr{O_4}$$

$$BaCr{O_4}$$

Mixture of 1,2,3

## Questions 20 of 50

Question:The solubility of $$PbC{l_2}$$ at $${25^o}C$$ is $$6.3 \times {10^{ - 3}}$$mole/litre. Its solubility product at that temperature is

### Answers Choices:

$$(6.3 \times {10^{ - 3}}) \times (6.3 \times {10^{ - 3}})$$

$$(6.3 \times {10^{ - 3}}) \times (12.6 \times {10^{ - 3}})$$

$$(6.3 \times {10^{ - 3}}) \times {(12.6 \times {10^{ - 3}})^2}$$

$$(12.6 \times {10^{ - 3}}) \times (12.6 \times {10^{ - 3}})$$

## Questions 21 of 50

Question:An aqueous solution of $$C{H_3}COONa$$ will be

Acidic

Alkaline

Neutral

None of these

## Questions 22 of 50

Question:Hydrolysis constant for a salt of weak acid and weak base would be

### Answers Choices:

$${K_h} = \frac{{{K_w}}}{{{K_a}}}$$

$${K_h} = \frac{{{K_w}}}{{{K_b}}}$$

$${K_h} = \frac{{{K_w}}}{{{K_a}{K_b}}}$$

None of these

## Questions 23 of 50

Question:Ammonium hydroxide is a weak base because

### Answers Choices:

It has low vapour pressure

It is only slightly ionized

It is not a hydroxide of any metal

It has low density

## Questions 24 of 50

Question:In which of the following dissociation of $$N{H_4}OH$$ will be minimum

### Answers Choices:

$$NaOH$$

$${H_2}O$$

$$N{H_4}Cl$$

$$NaCl$$

## Questions 25 of 50

Question:The values of dissociation constants of some acids (at $${25^o}C$$) are as follows. Indicate which is the strongest acid in water

### Answers Choices:

$$1.4 \times {10^{ - 2}}$$

$$1.6 \times {10^{ - 4}}$$

$$4.4 \times {10^{ - 10}}$$

$$4.3 \times {10^{ - 7}}$$

## Questions 26 of 50

Question:Concentration $$C{N^ - }$$ in $$0.1\,M\,HCN$$ is $$[{K_a} = 4 \times {10^{ - 10}}]$$

### Answers Choices:

$$2.5 \times {10^{ - 6}}M$$

$$4.5 \times {10^{ - 6}}M$$

$$6.3 \times {10^{ - 6}}M$$

$$9.2 \times {10^{ - 6}}M$$

## Questions 27 of 50

Question:The addition of solid sodium carbonate to pure water causes

### Answers Choices:

An increase in hydronium ion concentration

An increase in alkalinity

No change in acidity

A decrease in hydroxide ion concentration

## Questions 28 of 50

Question:The aqueous solution of which of the following salt has the lowest pH

### Answers Choices:

$$NaClO$$

$$NaCl{O_2}$$

$$NaCl{O_3}$$

$$NaCl{O_4}$$

## Questions 29 of 50

Question:Which is incorrect for buffer solution

### Answers Choices:

It contains weak acid and its conjugate base

It contains weak base and its conjugate acid

In this there is very less change is $$pH$$ value when very less amount of acid and base is mixed

None of the above

## Questions 30 of 50

Question:$$pH$$values of $$HCl$$ and $$NaOH$$ solutions each of strength $$\frac{N}{{100}}$$ will be respectively

2 and 2

2 and 12

12 and 2

2 and 10

## Questions 31 of 50

Question:What is the pH of $$0.1\,M\,N{H_3}$$

11.27

11.13

12

9.13

## Questions 32 of 50

Question:By adding a strong acid to the buffer solution, the pH of the buffer solution

Remains constant

Increases

Decreases

Becomes zero

## Questions 33 of 50

Question:The pH of the solution is 4. The hydrogen ion concentration of the solution in mol/litre is

### Answers Choices:

9.5

$${10^{ - 4}}$$

$${10^4}$$

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

## Questions 34 of 50

Question:$$NaO{H_{(aq)}},HC{l_{(aq)}}$$ and $$NaC{l_{(aq)}}$$ concentration of each is $${10^{ - 3}}M$$. Their pH will be respectively

10, 6, 2

11, 3, 7

10, 2, 6

3, 4, 7

## Questions 35 of 50

Question:$$pH$$of a solution can be expressed as

### Answers Choices:

$$- {\log _e}({H^ + })$$

$$- {\log _{10}}({H^ + })$$

$${\log _e}({H^ + })$$

$${\log _{10}}({H^ + })$$

## Questions 36 of 50

Question:The solution of sodium carbonate has pH

Greater than 7

Less than 7

Equal to 7

Equal to zero

## Questions 37 of 50

Question:$$pH$$ of $$HCl\,({10^{ - 12}}M)$$is

### Answers Choices:

12

$$- 12$$

$$\approx 7$$

14

## Questions 38 of 50

Question:Which one is buffer solution

### Answers Choices:

$$[PO_4^{ - --}]\,\,[[HPO_4^{ - - }]$$

$$[PO_3^{3--}]\,\,[[{H_2}PO_4^{-- - }]$$

$$[HPO_4^{-- - }]\,\,[[{H_2}PO_4^{-- - }]$$

All of these

## Questions 39 of 50

Question:The $$pOH$$of beer is 10.0. The hydrogen ion concentration will be

### Answers Choices:

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

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

$${10^{ - 8}}$$

$${10^{ - 4}}$$

## Questions 40 of 50

Question:When a buffer solution of sodium acetate and acetic acid is diluted with water

### Answers Choices:

Acetate ion concentration increases

$${H^ + }$$ion concentration increases

$$O{H^ - }$$ion concentration increases

$${H^ + }$$ion concentration remain unaltered

## Questions 41 of 50

Question:A base is dissolved in water yields a solution with a hydroxide ion concentration of 0.05 $$mol\,\,litr{e^{ - 1}}.$$ The solution is

Basic

Acid

Neutral

Both (1) and (2)

## Questions 42 of 50

Question:The $$pH$$ of a solution is increased from 3 to 6. Its $${H^ + }$$ion concentration will be

### Answers Choices:

Reduced to half

Doubled

Reduced by 1000 times

Increased by 1000 times

## Questions 43 of 50

Question:When $${10^{ - 8}}$$mole of $$HCl$$ is dissolved in one litre of water, the $$pH$$of the solution will be

8

7

Above 8

Below 7

## Questions 44 of 50

Question:The $$pH$$ of the solution containing 10 $$ml$$of 0.1 N $$NaOH$$ and 10 $$ml$$ of 0.05 N $${H_2}S{O_4}$$ would be

0

1

> 7

7

## Questions 45 of 50

Question:A solution of sodium chloride in contact with atmosphere has a $$pH$$of about

3.5

5

7

1.4

## Questions 46 of 50

Question:Which would decrease the $$pH$$ of $$25\,c{m^3}$$ of a $$0.01\,M$$ solution of hydrochloric acid

### Answers Choices:

The addition of $$25\,c{m^3}$$ $$0.005\,M$$ hydrochloric acid

The addition of $$25\,c{m^3}$$ of $$0.02\,M$$ hydrochloric acid

The addition of magnesium metal

None of these

## Questions 47 of 50

Question:The solution of $$N{a_2}C{O_3}$$ has $$pH$$

Greater than 7

Less than 7

Equal to 7

Equal to zero

## Questions 48 of 50

Question:Which is not a buffer solution

### Answers Choices:

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

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

$$C{H_3}COON{H_4}$$

Borax + Boric acid

## Questions 49 of 50

Question:Buffer solution is prepared by mixing

### Answers Choices:

Strong acid + its salt of strong base

Weak acid + its salt of weak base

Strong acid + its salt of weak base

Weak acid + its salt of strong base

## Questions 50 of 50

Question:The pH of millimolar HCl is

1

3

2

4