Ionic Equilibrium Test 3

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:Aq. solution of sodium cyanide is

Answers Choices:

Acidic

Amphoteric

Basic

Netural

Questions 2 of 50

Question:Which of the following is the strongest acid

Answers Choices:

\({H_3}P{O_4}\)

\({H_2}S{O_4}\)

\(HN{O_2}\)

\(C{H_3}COOH\)

Questions 3 of 50

Question:An example of a Lewis acid is

Answers Choices:

\(NaCl\)

\({25^o}C\)

\(AlC{l_3}\)

\(SnC{l_4}\)

Questions 4 of 50

Question:Which of the following is a conjugated acid-base pair

Answers Choices:

\(HCl,\,\,NaOH\)

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

\({H_2}S{O_4},\,\,HS{O_4}^ - \)

\(KCN,\,\,HCN\)

Questions 5 of 50

Question:The solution of strong acid and weak base \(N{H_4}Cl\)is

Answers Choices:

Acidic

Basic

Neutral

None of the above

Questions 6 of 50

Question:Lewis base is

Answers Choices:

\(C{O_2}\)

\(S{O_3}\)

\(S{O_2}\)

\(ROH\)

Questions 7 of 50

Question:\(1 \times {10^{ - 12}}\) of \(1\,\,M\,\,{H_2}S{O_4}\) will completely neutralize

Answers Choices:

\(10\,\,ml\) of \(1\,\,M\,\,NaOH\) solution

\(10\,\,ml\) of \(2\,\,M\,\,NaOH\) solution

\(5\,\,ml\) of \(2\,\,M\,\,KOH\) solution

\(5\,\,ml\) of \(1\,\,M\,\,N{a_2}C{O_3}\) solution

Questions 8 of 50

Question:The strength of an acid depends on its tendency to

Answers Choices:

Accept protons

Donate protons

Accept electrons

Donate electrons

Questions 9 of 50

Question:In Lewis acid-base theory, neutralization reaction may be considered as

Answers Choices:

Formation of salt and water

Competition for protons by acid and base

Oxidation reduction

Coordinate covalent bond formation

Questions 10 of 50

Question:The strongest acid is

Answers Choices:

\({H_3}As{O_4}\)

\({H_3}As{O_3}\)

\({H_3}P{O_3}\)

\({H_3}P{O_4}\)

Questions 11 of 50

Question:Which of the following is the strongest base

Answers Choices:

\({C_2}H_5^ - \)

\({C_2}{H_5}CO{O^ - }\)

\({C_2}{H_5}{O^ - }\)

\(O{H^ - }\)

Questions 12 of 50

Question:According to Bronsted-Lowry concept, base is a substance which is

Answers Choices:

A proton donor

An electron pair acceptor

A proton acceptor

An electron pair donor

Questions 13 of 50

Question:Which of the following is known as hydronium ion

Answers Choices:

\({H^ + }\)

\({H_2}{O^ + }\)

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

\({H_2}O_2^ + \)

Questions 14 of 50

Question:The most acidic compound in water is

Answers Choices:

\(AlC{l_3}\)

\(BeC{l_2}\)

\(FeC{l_3}\)

None of these

Questions 15 of 50

Question:\(B{F_3}\) is used as a catalyst in several industrial processes due to its

Answers Choices:

Strong reducing agent

Weak reducing agent

Strong Lewis acid nature

Weak Lewis acid character

Questions 16 of 50

Question:Orthoboric acid in aqueous medium is

Answers Choices:

Monobasic

Dibasic

Tribasic

All are correct

Questions 17 of 50

Question:According to Lewis concept which one of the following is not a base

Answers Choices:

\(O{H^ - }\)

\({H_2}O\)

\(A{g^ + }\)

\(N{H_3}\)

Questions 18 of 50

Question:Conjugate base of \(HBr\)is

Answers Choices:

\({H_2}B{r^ + }\)

\({H^ + }\)

\(B{r^ - }\)

\(B{r^ - }\)

Questions 19 of 50

Question:Molar heat of neutralization of \(NaOH\) with \(HCl\) in comparison to that of \(KOH\) with \(HN{O_3}\)is

Answers Choices:

Less

More

Equal

Depends on pressure

Questions 20 of 50

Question:On addition of ammonium chloride to a solution of ammonium hydroxide

Answers Choices:

Dissociation of \(N{H_4}OH\)increases

Concentration of \(O{H^ - }\)increases

Concentration of \(O{H^ - }\)decreases

Concentration of \(NH_4^ + \) and \(O{H^ - }\)increases

Questions 21 of 50

Question:The solubility product of a salt having general formula \(M{X_2},\) in water is : \(4 \times {10^{ - 12}}\). The concentration of \({M^{2 + }}\) ions in the aqueous solution of the salt is

Answers Choices:

\(2.0 \times {10^{ - 6}}M\)

\(1.0 \times {10^{ - 4}}M\)

\(1.6 \times {10^{ - 4}}M\)

\(4.0 \times {10^{ - 10}}M\)

Questions 22 of 50

Question:A precipitate of \(AgCl\) is formed when equal volumes of the following are mixed. \([{K_{sp}}\) for \(AgCl = {10^{ - 10}}]\)

Answers Choices:

\({10^{ - 4}}M\,AgN{O_3}\) and \({10^{ - 7}}M\,HCl\)

\({10^{ - 5}}M\,AgN{O_3}\) and \({10^{ - 6}}M\,HCl\)

\({10^{ - 5}}M\,AgN{O_3}\) and \({10^{ - 4}}M\,HCl\)

\({10^{ - 6}}M\,AgN{O_3}\) and \({10^{ - 6}}M\,HCl\)

Questions 23 of 50

Question:The solubility of silver chromate in 0.01 M \({K_2}Cr{O_4}\) is \(2 \times {10^{ - 8}}mol\,d{m^{ - 3}}\). The solubility product of silver chromate will be

Answers Choices:

\(8 \times {10^{ - 24}}\)

\(16 \times {10^{ - 24}}\)

\(1.6 \times {10^{ - 18}}\)

\(16 \times {10^{ - 18}}\)

Questions 24 of 50

Question:Which pair will show common ion effect

Answers Choices:

\(BaC{l_2} + Ba\,{(N{O_3})_2}\)

\(NaCl + HCl\)

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

\(AgCN + KCN\)

Questions 25 of 50

Question:Which is least soluble in water

Answers Choices:

\(AgCl\)

\(AgF\)

\(AgI\)

\(A{g_2}S\)

Questions 26 of 50

Question:The solubility of \(PbC{l_2}\)is

Answers Choices:

\(\sqrt {{K_{sp}}} \)

\(^3\sqrt {{K_{sp}}} \)

\(^3\sqrt {\frac{{{K_{sp}}}}{4}} \)

\(\sqrt {8{K_{sp}}} \)

Questions 27 of 50

Question:The solubility product of \(1 \times {10^{ - 5}}\) is \(1.44 \times {10^{ - 4}}\) at\({100^o}C\). The solubility of silver chloride in boiling water may be

Answers Choices:

\(0.72 \times {10^{ - 4}}\,M\)

\(1.20 \times {10^{ - 2}}\,M\)

\({80^o}C,\)

\(0.5\,M\,HCOOH,\)

Questions 28 of 50

Question:When \(N{H_4}Cl\) is added to \(N{H_4}OH\) solution, the dissociation of ammonium hydroxide is reduced. It is due to

Answers Choices:

Common ion effect

Hydrolysis

Oxidation

Reduction

Questions 29 of 50

Question:At 298 K, the solubility of \(PbC{l_2}\) is \(2 \times {10^{ - 2}}mol/lit\), then \({k_{sp}} = \)

Answers Choices:

\(1 \times {10^{ - 7}}\)

\(3.2 \times {10^{ - 7}}\)

\(1 \times {10^{ - 5}}\)

\(3.2 \times {10^{ - 5}}\)

Questions 30 of 50

Question:Solubility product for salt \(A{B_2}\) is \(4 \times {10^{ - 12}}\). Calculate solubility

Answers Choices:

\(1 \times {10^{ - 3}}gm\,\,mol\,/\,litre\)

\(1 \times {10^{ - 5}}gm\,\,mol\,/\,litre\)

\(1 \times {10^{ - 4}}gm\,\,mol\,/\,litre\)

\(1 \times {10^{ - 2}}gm\,\,mol\,/\,litre\)

Questions 31 of 50

Question:Solubility product of a salt AB is \(1 \times {10^{ - 8}}\) in a solution in which concentration of A is \({10^{ - 3}}M\). The salt will precipitate when the concentration of B becomes more than

Answers Choices:

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

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

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

\({10^{ - 5}}M\)

Questions 32 of 50

Question:Which one of the following is most soluble

Answers Choices:

\(CuS\,({K_{sp}} = 8 \times {10^{ - 37}})\)

\(MnS\,({K_{sp}} = 7 \times {10^{ - 16}})\)

\(B{i_2}{S_3}\,({K_{sp}} = 1 \times {10^{ - 70}})\)

\(A{g_2}S\,({K_{sp}} = 6 \times {10^{ - 51}})\)

Questions 33 of 50

Question:The solubility product of \(PbC{l_2}\) at \({20^o}C\) is \(1.5 \times {10^{ - 4}}.\) Calculate the solubility

Answers Choices:

\(3.75 \times {10^{ - 4}}\)

\(3.34 \times {10^{ - 2}}\)

\(3.34 \times {10^2}\)

None of these

Questions 34 of 50

Question:The solubility of \(S{b_2}{S_3}\)in water is \(1.0 \times {10^{ - 5}}\)mol / litre at 298 K. What will be its solubility product

Answers Choices:

\(108 \times {10^{ - 25}}\)

\(1.0 \times {10^{ - 25}}\)

\(144 \times {10^{ - 25}}\)

\(126 \times {10^{ - 24}}\)

Questions 35 of 50

Question:The ionic product of water at \({25^o}C\) is \({10^{ - 14}}.\) The ionic product at \({90^o}C\) will be

Answers Choices:

\(1 \times {10^{ - 20}}\)

\(1 \times {10^{ - 12}}\)

\(1 \times {10^{ - 14}}\)

\(1 \times {10^{ - 16}}\)

Questions 36 of 50

Question:Which is generally true about ionic compounds

Answers Choices:

Have low boiling point

Have low melting point

Soluble in non polar solvents

Conduct electricity in the fused state

Questions 37 of 50

Question:0.2 molar solution of formic acid is ionized 3.2%. Its ionization constant is

Answers Choices:

\(1 \times {10^{ - 12}}\)

\(2.1 \times {10^{ - 4}}\)

\(1.25 \times {10^{ - 6}}\)

\(1 \times {10^{ - 14}}\)

Questions 38 of 50

Question:The \(pH\) of a solution in which the \([{H^ + }] = 0.01,\)is

Answers Choices:

2

1

4

3

Questions 39 of 50

Question:A is an aqueous acid; B is an aqueous base. They are diluted separately, then

Answers Choices:

\(pH\) of A increases and \(pH\) of B decreases

\(pH\) of A increases and \(pH\) of B decreases till \(pH\) in each case is 7

\(pH\) of A and B increase

\(pH\) of B and A decrease

Questions 40 of 50

Question:By adding \(20\,ml\) \(0.1\,N\,HCl\) to \(20\,ml\) \(0.001\,N\,\) \(KOH,\) the pH of the obtained solution will be

Answers Choices:

2

1.3

0

7

Questions 41 of 50

Question:Which of the following salt is acidic

Answers Choices:

\(N{a_2}S{O_4}\)

\(NaHS{O_3}\)

\(N{a_2}S{O_3}\)

\(N{a_2}S\)

Questions 42 of 50

Question:The \(pH\) of a simple sodium acetate buffer is given by \(pH = p{K_a} + \log \frac{{[Salt]}}{{[Acid]}}\)\({K_a}\)of acetic acid \( = 1.8 \times {10^{ - 5}}\)If[Salt] =[Acid] = 0.1 M, the \(pH\)of the solution would be about

Answers Choices:

7

4.7

5.3

1.4

Questions 43 of 50

Question:A compound whose aqueous solution will have the highest \(pH\)

Answers Choices:

\(NaCl\)

\(N{a_2}C{O_3}\)

\(N{H_4}Cl\)

\(NaHC{O_3}\)

Questions 44 of 50

Question:Which of the following solutions can act as buffer

Answers Choices:

0.1 molar aq. \(NaCl\)

0.1 molar aq. \(C{H_3}COOH + 0.1\)molar \(NaOH\)

0.1 molar aq. ammonium acetate

None of the above

Questions 45 of 50

Question:In a solution of acid \({H^ + }\)concentration is \({10^{ - 10}}M.\) The pH of this solution will be

Answers Choices:

8

6

Between 6 and 7

Between 3 and 6

Questions 46 of 50

Question:\({10^{ - 6}}M\,\,HCl\) is diluted to 100 times. Its \(pH\)is

Answers Choices:

6

8

6.95

9.5

Questions 47 of 50

Question:The dissociation constant of HCN is \(5 \times {10^{ - 10}}\). The \(pH\) of the solution prepared by mixing 1.5 mole of HCN and 0.15 moles of KCN in water and making up the total volume to \(0.5\,d{m^3}\) is

Answers Choices:

7.302

9.302

8.302

10.302

Questions 48 of 50

Question:If \({H^ + }\)ion concentration of a solution is increased by 10 times its pH will be

Answers Choices:

Increase by one

Remains unchanged

Decrease by one

Increase by 10

Questions 49 of 50

Question:A solution of weak acids is diluted by adding an equal volume of water. Which of the following will not change

Answers Choices:

Strength of the acid

The value of \([{H_3}{O^ + }]\)

\(pH\)of the solution

The degree of dissociation of acid

Questions 50 of 50

Question:Which one of the following statements is not true

Answers Choices:

The conjugate base of \({H_2}PO_4^ - \) is \(HPO_4^{2 - }\)

\(pH + pOH = 14\) for all aqueous solutions

The \(pH\) of \(1 \times {10^{ - 8}}M\,HCl\) is 8

96,500 coulombs of electricity when passed through a \(CuS{O_4}\) solution deposits 1 gram equivalent of copper at the cathode