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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

2 and 2

2 and 12

12 and 2

2 and 10

Questions 31 of 50

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

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

Answers Choices:

0

1

> 7

7

Questions 45 of 50

Question:A solution of sodium chloride in contact with atmosphere has a \(pH\)of about

Answers Choices:

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 \(pH\)

Answers Choices:

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

Answers Choices:

1

3

2

4