Ionic Equilibrium Test 2

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:Lewis acid

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

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

\(CrC{l_3}\)

\(CuS{O_4}\)

Questions 4 of 50

Question:The aqueous solution of disodium hydrogen phosphate is

Answers Choices:

Acidic

Neutral

Basic

None

Questions 5 of 50

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

Answers Choices:

\(SnC{l_2}\)

\(C{l^ - }\)

\(SnC{l_4}\)

None of these

Questions 6 of 50

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

Answers Choices:

\({I_2}\)

\({I^ - }\)

\({I_3}^ - \)

None of these

Questions 7 of 50

Question:The correct order of acid strength is

Answers Choices:

\(HClO < HCl{O_2} < HCl{O_3} < HCl{O_4}\)

\(HCl{O_4} < HClO < HCl{O_2} < HCl{O_3}\)

\(HCl{O_2} < HCl{O_3} < HCl{O_4} < HClO\)

\(HCl{O_4} < HCl{O_3} < HCl{O_2}\)\( < HClO\)

Questions 8 of 50

Question:Which of the following is Lewis acid

Answers Choices:

\(B{F_3}\)

\(C{l^ - }\)

\({H_2}O\)

\(N{H_3}\)

Questions 9 of 50

Question:\(p{K_a}\)value of the strongest acid among the following is

Answers Choices:

3

4.5

1

2

Questions 10 of 50

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

Answers Choices:

\(SnC{l_4}\)

\(FeC{l_3}\)

\(KCl\)

\(B{F_3}\)

Questions 11 of 50

Question:Which of the following can give base \(O{H^ - }\)

Answers Choices:

\({H_2}O\)

\({H_3}{O^ + }\)

\({H_2}\)

\(HCl\)

Questions 12 of 50

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

Answers Choices:

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

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

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

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

Questions 13 of 50

Question:The aqueous solution of \(FeC{l_3}\) is acidic due to

Answers Choices:

Acidic impurities

Ionisation

Hydrolysis

Dissociation

Questions 14 of 50

Question:Which will not be hydrolysed

Answers Choices:

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

Answers Choices:

\(3.3750 \times {10^{ - 12}}\)

\(1.6875 \times {10^{ - 10}}\)

\(1.6875 \times {10^{ - 12}}\)

\(1.6875 \times {10^{ - 11}}\)

Questions 16 of 50

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

Answers Choices:

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 \(4 \times {10^{ - 10}}\))

Answers Choices:

\(4 \times {10^{ - 10}}M\)

\(2 \times {10^{ - 7}}M\)

\(4 \times {10^{ - 6}}M\)

\(2 \times {10^{ - 3}}M\)

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

Answers Choices:

\(6{y^4}\)

\(64{y^4}\)

\(36{y^5}\)

\(108{y^5}\)

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

Answers Choices:

\(2 \times {10^{ - 4}}\)

\(4 \times {10^{ - 4}}\)

\(5.6 \times {10^{ - 6}}\)

\(3.1 \times {10^{ - 4}}\)

Questions 20 of 50

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

Answers Choices:

\(2.5 \times {10^{ - 5}}\)

\(1.5 \times {10^{ - 4}}\)

\(3.125 \times {10^{ - 6}}\)

\(6.25 \times {10^{ - 4}}\)

Questions 21 of 50

Question:An ionizing solvent has

Answers Choices:

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

Answers Choices:

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

Answers Choices:

Chloroform

Benzene

Toluene

Magnesium chloride

Questions 24 of 50

Question:In weak electrolytic solution, degree of ionization

Answers Choices:

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

Answers Choices:

2

7

10

12

Questions 26 of 50

Question:\(pH\) of a solution is 5. Its hydroxyl ion concentration is

Answers Choices:

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

Answers Choices:

3.2

1.9

3.4

3.5

Questions 28 of 50

Question:On adding solid potassium cyanide to water

Answers Choices:

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

Answers Choices:

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

Answers Choices:

4

5

6

7

Questions 31 of 50

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

Answers Choices:

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

Answers Choices:

10

0.1

1

2

Questions 33 of 50

Question:Which of the following mixtures forms an acid buffer

Answers Choices:

\(NaOH + HCl\)

\(C{H_3}COOH + C{H_3}COONa\)

\(N{H_4}OH + N{H_4}Cl\)

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

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

Answers Choices:

10

9

4

7

Questions 35 of 50

Question:The defination of \(pH\)is

Answers Choices:

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

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

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

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

Questions 36 of 50

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

Answers Choices:

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 \(C{H_3}COOH = 4.5)\)

Answers Choices:

\(0.1\,\,m\)

\(0.2\,\,m\)

\(1.0\,\,m\)

\(10.0\,\,m\)

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

Answers Choices:

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 \(({K_w} = {10^{ - 14}})\)

Answers Choices:

4

6

8

10

Questions 40 of 50

Question:An aqueous solution whose \(O{H^ - }\) is

Answers Choices:

Alkaline

Acidic

Neutral

Amphoteric

Questions 41 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

3

8

11

14

Questions 45 of 50

Question:\(pH\)of a 10 \(M\) solution of \(HCl\) is

Answers Choices:

Less than 0

2

0

1

Questions 46 of 50

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

Answers Choices:

7

>7

<7

0

Questions 47 of 50

Question:The pH of normal KOH is

Answers Choices:

1

0

14

7

Questions 48 of 50

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

Answers Choices:

\({10^{12}}\)

\({10^{ - 2}}\)

\({10^{ - 1}}\)

\({10^{ - 12}}\)

Questions 49 of 50

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

Answers Choices:

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

Answers Choices:

\(NaCl\) and \(NaOH\)

\(NaOH\) and \(N{H_4}OH\)

\(C{H_3}COON{H_4}\) and \(HCl\)

Borax and boric acid