Redox Reaction Test 4

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:\({H_2}{O_2}\) reduces \(Mn{O_4}^ - \) ion to

Answers Choices:

\(M{n^ + }\)

\(M{n^{2 + }}\)

\(M{n^{3 + }}\)

\(M{n^ - }\)

Questions 2 of 50

Question:When a sulphur atom becomes a sulphide ion

Answers Choices:

There is no change in the composition of atom

It gains two electrons

The mass number changes

None of these

Questions 3 of 50

Question:The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are

Answers Choices:

\({H_2}O\) alone

\(C{O_2}\)alone

\({H_2}O\) and \(C{O_2}\)

None of these

Questions 4 of 50

Question:\(SnC{l_2}\)gives a precipitate with a solution of \(HgC{l_2}.\)In this process \(HgC{l_2}\)is

Answers Choices:

Reduced

Oxidised

Converted into a complex compound containing both \(Sn\) and \(Hg\)

Converted into a chloro complex of \(Hg\)

Questions 5 of 50

Question:Oxidation involves

Answers Choices:

Loss of electrons

Gain of electrons

Increase in the valency of negative part

Decrease in the valency of positive part

Questions 6 of 50

Question:Incorrect statement regarding rusting is

Answers Choices:

Metallic iron is oxidised to \(F{e^{3 + }}\)ions

Metallic iron is reduced to \(F{e^{2 - }}\) ions

Oxygen gas is reduced to oxide ion

Yellowish – brown product is formed

Questions 7 of 50

Question:When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because, copper

Answers Choices:

Displaces silver from the solution

Forms a blue coloured complex with \(AgN{O_3}\)

Is oxidised to \(C{u^{2 + }}\)

Is reduced to \(C{u^{2 + }}\)

Questions 8 of 50

Question:Which halide is not oxidised by \(Mn{O_2}\)

Answers Choices:

\(F\)

\(Cl\)

\(Br\)

\(I\)

Questions 9 of 50

Question:When \(F{e^{2 + }}\) changes to \(F{e^{3 + }}\) in a reaction

Answers Choices:

It loses an electron

It gains an electron

It loses a proton

It gains a proton

Questions 10 of 50

Question:In acid solution, the reaction \(MnO_4^ - \, \to \,M{n^{2 + }}\) involves

Answers Choices:

Oxidation by 3 electrons

Reduction by 3 electrons

Oxidation by 5 electrons

Reduction by 5 electrons

Questions 11 of 50

Question:When iron or zinc is added to \(CuS{O_4}\) solution, copper is precipitated. It is due to

Answers Choices:

Oxidation of \(C{u^{ + 2}}\)

Reduction of \(C{u^{ + 2}}\)

Hydrolysis of \(CuS{O_4}\)

Ionization of \(CuS{O_4}\)

Questions 12 of 50

Question:Which of the following cannot work as oxidising agent

Answers Choices:

\({O_2}\)

\(KMn{O_4}\)

\({I_2}\)

None of these

Questions 13 of 50

Question:\({H_2}{O_2}\) is used as

Answers Choices:

An oxidant only

A reductant only

An acid only

An oxidant, a reductant and an acid

Questions 14 of 50

Question:In \(C + {H_2}O\, \to \,\,CO + {H_2},\,\,{H_2}O\) acts as

Answers Choices:

Oxidising agent

Reducing agent

(1) and (2) both

None of these

Questions 15 of 50

Question:Which is the best description of the behaviour of bromine in the reaction given below \({H_2}O + B{r_2} \to HOBr + HBr\)

Answers Choices:

Oxidised only

Reduced only

Proton acceptor only

Both oxidised and reduced

Questions 16 of 50

Question:What is the oxidising agent in chlorine water

Answers Choices:

\(HCl\)

\(HCl{O_2}\)

\(HOCl\)

None of these

Questions 17 of 50

Question:In the reaction \(A{g_2}O + {H_2}{O_2} \to 2Ag + {H_2}O + {O_2}\) , the \({H_2}{O_2}\) acts as

Answers Choices:

Reducing agent

Oxidising agent

Bleaching agent

None of the above

Questions 18 of 50

Question:The oxidation number of chlorine in \(HOCl\)

Answers Choices:

1

0

1

2

Questions 19 of 50

Question:Oxidation number of \(S\) in \({S^{2 - }}\) is

Answers Choices:

2

0

6

2

Questions 20 of 50

Question:Oxidation number of \(N\) in \({(N{H_4})_2}S{O_4}\) is

Answers Choices:

1 / 3

1

1

3

Questions 21 of 50

Question:The oxidation number of \(Pt\)in \({[Pt({C_2}{H_4})\,C{l_3}]^ - }\) is

Answers Choices:

1

2

3

4

Questions 22 of 50

Question:The oxidation number of carbon in \(C{H_2}C{l_2}\) is

Answers Choices:

0

2

\( - 2\)

4

Questions 23 of 50

Question:The oxidation states of phosphorus vary from

Answers Choices:

3 to +5

1 to +1

3 to +3

5 to +1

Questions 24 of 50

Question:The oxidation state of chlorine in \(KCl{O_4}\) is

Answers Choices:

1

1

7

7

Questions 25 of 50

Question:The oxidation state of \(I\) in \({H_4}IO_6^ - \) is

Answers Choices:

7

5

1

1

Questions 26 of 50

Question:An element which never has a positive oxidation number in any of its compounds

Answers Choices:

Boron

Oxygen

Chlorine

Fluorine

Questions 27 of 50

Question:Oxidation state of oxygen in hydrogen peroxide is

Answers Choices:

1

1

0

2

Questions 28 of 50

Question:The oxidation number of \(Cr\) in \({K_2}C{r_2}{O_7}\)is

Answers Choices:

6

7

2

2

Questions 29 of 50

Question:In which of the following compounds transition metal is in oxidation state zero

Answers Choices:

\([Co{(N{H_3})_6}]C{l_2}\)

\([Fe{({H_2}O)_6}S{O_4}]\)

\([Ni{(CO)_4}]\)

\([Fe{({H_2}O)_3}]{(OH)_2}\)

Questions 30 of 50

Question:Oxidation number of osmium \((Os)\) in \(Os{O_4}\) is

Answers Choices:

4

6

7

8

Questions 31 of 50

Question:The oxidation number of nitrogen in \(N{H_2}OH\) is

Answers Choices:

1

1

3

2

Questions 32 of 50

Question:The oxidation number of phosphorus in \(Ba{({H_2}P{O_2})_2}\) is

Answers Choices:

1

1

2

3

Questions 33 of 50

Question:A compound is in its low oxidation state. Then its will be

Answers Choices:

Highly acidic

Highly basic

Highest oxidising property

Half acidic, half basic

Questions 34 of 50

Question:The oxidation number and the electronic configuration of sulphur in \({H_2}S{O_4}\)is

Answers Choices:

+ 4;\(1{s^2}2{s^2}2{p^6}3{s^2}\)

+ 2; \(1{s^2}2{s^2}2{p^6}3{s^2}3{p^2}\)

+ 3; \(1{s^2}2{s^2}2{p^6}3{s^2}3{p^1}\)

+ 6; \(1{s^2}2{s^2}2{p^6}\)

Questions 35 of 50

Question:Carbon has zero oxidation number in

Answers Choices:

\(CO\)

\(C{H_4}\)

\(C{H_2}C{l_2}\)

\(C{H_3}Cl\)

Questions 36 of 50

Question:Oxidation state of oxygen atom in potassium superoxide is

Answers Choices:

0

1

\( - {\textstyle{1 \over 2}}\)

2

Questions 37 of 50

Question:Oxidation number of \(S\)in \({S_2}C{l_2}\) is

Answers Choices:

1

1

6

0

Questions 38 of 50

Question:What is the oxidation number of sulphur in \(N{a_2}{S_4}{O_6}\)

Answers Choices:

\(\frac{2}{3}\)

\(\frac{3}{2}\)

\(\frac{3}{5}\)

\(\frac{5}{2}\)

Questions 39 of 50

Question:What is the net charge on ferrous ion

Answers Choices:

2

3

4

5

Questions 40 of 50

Question:Which of the following elements never show positive oxidation number

Answers Choices:

\(O\)

\(Fe\)

\(Ga\)

\(F\)

Questions 41 of 50

Question:The oxidation state shown by silicon when it combines with strongly electropositive metals is

Answers Choices:

2

4

4

2

Questions 42 of 50

Question:The oxidation number of sulphur in \({H_2}S\) is

Answers Choices:

2

3

2

3

Questions 43 of 50

Question:Which of the following is a redox reaction

Answers Choices:

\(NaCl + KN{O_3} \to NaN{O_3} + KCl\)

\(Ca{C_2}{O_4} + 2HCl \to CaC{l_2} + {H_2}{C_2}{O_4}\)

\(Mg{(OH)_2} + 2N{H_4}Cl \to MgC{l_2} + 2N{H_4}OH\)

\(Zn + 2AgCN \to 2Ag + Zn{(CN)_2}\)

Questions 44 of 50

Question:Which of the following reaction is a redox reaction

Answers Choices:

\({P_2}{O_5} + 2{H_2}O \to {H_4}{P_2}{O_7}\)

\(2AgN{O_3} + BaC{l_2} \to 2AgCl + Ba{(N{O_3})_2}\)

\(BaC{l_2} + {H_2}S{O_4} \to BaS{O_4} + 2HCl\)

\(Cu + 2AgN{O_3} \to 2Ag + Cu{(N{O_3})_2}\)

Questions 45 of 50

Question:Which of the following reactions involves oxidation-reduction

Answers Choices:

\(NaBr + HCl\, \to \,NaCl + HBr\)

\(HBr + AgN{O_3}\, \to \,AgBr + HN{O_3}\)

\({H_2} + B{r_2}\, \to \,2HBr\)

\(2NaOH + {H_2}S{O_4}\, \to \,N{a_2}S{O_4} + 2{H_2}O\)

Questions 46 of 50

Question:Which of the following is the strongest oxidising agent

Answers Choices:

\(BrO_3^ - /B{r^{2 + }},\,{E^o} = + 1.50\)

\(F{e^{3 + }}/F{e^{2 + }},\,{E^o} = + 0.76\)

\(MnO_4^ - /M{n^{2 + }},\,{E^o} = + 1.52\)

\(C{r_2}O_7^{2 - }/C{r^{3 + }},\,{E^o} = + 1.33\)

Questions 47 of 50

Question:In the reaction \({I_2} + 2{S_2}O_3^{ - - } \to 2{I^ - } + {S_4}O_6^{ - - }\) equivalent weight of iodine will be equal to

Answers Choices:

1/2 of molecular weight

Molecular weight

1/4 of molecular weight

None

Questions 48 of 50

Question:The equivalent weight of \(KI{O_3}\) in the reaction \(2Cr{(OH)_3} + 4OH + KI{O_3} \to 2CrO_4^{2 - } + 5{H_2}O + KI\) is

Answers Choices:

Mole wt.

\(\frac{{{\rm{Mol}}{\rm{. wt}}{\rm{.}}}}{{\rm{6}}}\)

\(\frac{{{\rm{Mol}}{\rm{. wt}}{\rm{.}}}}{{\rm{2}}}\)

\(\frac{{{\rm{Mol}}{\rm{. wt}}{\rm{.}}}}{{\rm{3}}}\)

Questions 49 of 50

Question:The product of oxidation of \({I^ - }\) with \(MnO_4^ - \) in alkaline medium is

Answers Choices:

\(IO_3^ - \)

\({I_2}\)

\(I{O^ - }\)

\(IO_4^ - \)

Questions 50 of 50

Question:In alkaline medium \(Cl{O_2}\) oxidize \({H_2}{O_2}\) in \({O_2}\) and reduced itself in \(C{l^ - }\) then how many mole of \({H_2}{O_2}\) will oxidize by one mole of \(Cl{O_2}\)

Answers Choices:

1

1.5

2.5

3.5

5