# 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

$$M{n^ + }$$

$$M{n^{2 + }}$$

$$M{n^{3 + }}$$

$$M{n^ - }$$

## Questions 2 of 50

Question:When a sulphur atom becomes a sulphide ion

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

$${H_2}O$$ 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

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

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

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

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 $$Mn{O_2}$$

$$F$$

$$Cl$$

$$Br$$

$$I$$

## Questions 9 of 50

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

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

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

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

$${O_2}$$

$$KMn{O_4}$$

$${I_2}$$

None of these

## Questions 13 of 50

Question:$${H_2}{O_2}$$ is used as

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

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 $${H_2}O + B{r_2} \to HOBr + HBr$$

Oxidised only

Reduced only

Proton acceptor only

Both oxidised and reduced

## Questions 16 of 50

Question:What is the oxidising agent in chlorine water

$$HCl$$

$$HCl{O_2}$$

$$HOCl$$

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

Reducing agent

Oxidising agent

Bleaching agent

None of the above

## Questions 18 of 50

Question:The oxidation number of chlorine in $$HOCl$$

1

0

1

2

## Questions 19 of 50

Question:Oxidation number of $$S$$ in $${S^{2 - }}$$ is

2

0

6

2

## Questions 20 of 50

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

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

1

2

3

4

## Questions 22 of 50

Question:The oxidation number of carbon in $$C{H_2}C{l_2}$$ is

0

2

$$- 2$$

4

## Questions 23 of 50

Question:The oxidation states of phosphorus vary from

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

1

1

7

7

## Questions 25 of 50

Question:The oxidation state of $$I$$ in $${H_4}IO_6^ -$$ is

7

5

1

1

## Questions 26 of 50

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

Boron

Oxygen

Chlorine

Fluorine

## Questions 27 of 50

Question:Oxidation state of oxygen in hydrogen peroxide is

1

1

0

2

## Questions 28 of 50

Question:The oxidation number of $$Cr$$ in $${K_2}C{r_2}{O_7}$$is

6

7

2

2

## Questions 29 of 50

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

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

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

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

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

## Questions 30 of 50

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

4

6

7

8

## Questions 31 of 50

Question:The oxidation number of nitrogen in $$N{H_2}OH$$ is

1

1

3

2

## Questions 32 of 50

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

1

1

2

3

## Questions 33 of 50

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

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

+ 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

$$CO$$

$$C{H_4}$$

$$C{H_2}C{l_2}$$

$$C{H_3}Cl$$

## Questions 36 of 50

Question:Oxidation state of oxygen atom in potassium superoxide is

0

1

$$- {\textstyle{1 \over 2}}$$

2

## Questions 37 of 50

Question:Oxidation number of $$S$$in $${S_2}C{l_2}$$ is

1

1

6

0

## Questions 38 of 50

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

$$\frac{2}{3}$$

$$\frac{3}{2}$$

$$\frac{3}{5}$$

$$\frac{5}{2}$$

## Questions 39 of 50

Question:What is the net charge on ferrous ion

2

3

4

5

## Questions 40 of 50

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

$$O$$

$$Fe$$

$$Ga$$

$$F$$

## Questions 41 of 50

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

2

4

4

2

## Questions 42 of 50

Question:The oxidation number of sulphur in $${H_2}S$$ is

2

3

2

3

## Questions 43 of 50

Question:Which of the following is a redox reaction

$$NaCl + KN{O_3} \to NaN{O_3} + KCl$$

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

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

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

## Questions 44 of 50

Question:Which of the following reaction is a redox reaction

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

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

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

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

## Questions 45 of 50

Question:Which of the following reactions involves oxidation-reduction

$$NaBr + HCl\, \to \,NaCl + HBr$$

$$HBr + AgN{O_3}\, \to \,AgBr + HN{O_3}$$

$${H_2} + B{r_2}\, \to \,2HBr$$

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

## Questions 46 of 50

Question:Which of the following is the strongest oxidising agent

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

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

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

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

## 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

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

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

$$IO_3^ -$$

$${I_2}$$

$$I{O^ - }$$

$$IO_4^ -$$

## 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 $$Cl{O_2}$$