Redox Reaction Test 1

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:When \(P\) reacts with caustic soda, the products are \(P{H_3}\) and \(Na{H_2}P{O_2}.\) This reaction is an example of

Answers Choices:

Oxidation

Reduction

Oxidation and reduction (Redox)

Neutralization

Questions 2 of 50

Question:Which one of the following does not get oxidised by bromine water

Answers Choices:

\(F{e^{ + 2}}\) to \(F{e^{ + 3}}\)

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

\(M{n^{ + 2}}\) to \(MnO_4^ - \)

\(S{n^{ + 2}}\) to \(S{n^{ + 4}}\)

Questions 3 of 50

Question:In the reaction \({H_2}S + N{O_2} \to {H_2}O + NO + S.\) \({H_2}S\) is

Answers Choices:

Oxidised

Reduced

Precipitated

None of these

Questions 4 of 50

Question:The conversion of \(Pb{O_2}\) to \(Pb{(N{O_3})_2}\)is

Answers Choices:

Oxidation

Reduction

Neither oxidation nor reduction

Both oxidation and reduction

Questions 5 of 50

Question:Solution of sodium metal in liquid ammonia is strongly reducing due to the presence of the following in the solution

Answers Choices:

Sodium atoms

Solvated electrons

Sodium hydride

Sodium amide

Questions 6 of 50

Question:When \(S{n^{2 + }}\)changes to \(S{n^{4 + }}\)in a reaction

Answers Choices:

It loses two electrons

It gains two electrons

It loses two protons

It gains two protons

Questions 7 of 50

Question:Oxidation of thiosulphate \(2{H_2}(g) + {O_2}(g) \to 2{H_2}O(l)\)ion by iodine gives

Answers Choices:

\((mol.\,\,wt.\, = M)\)

\(SO_4^{2 - }\)

\({S_4}O_6^{2 - }\)

\({S_2}O_6^{2 - }\)

Questions 8 of 50

Question:\(Z{n^{2 + }}(aq) + 2e\, \to \,Zn(s).\) This is

Answers Choices:

Oxidation

Reduction

Redox reaction

None of these

Questions 9 of 50

Question:In the reaction, \(4Fe + 3{O_2} \to 4F{e^{3 + }} + 6{O^{2 - }}\) which of the following statement is incorrect

Answers Choices:

A Redox reaction

Metallic iron is a reducing agent

\(F{e^{3 + }}\) is an oxidising agent

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

Questions 10 of 50

Question:Which of the following is redox reaction

Answers Choices:

\({H_2}S{O_4}\) with \(NaOH\)

In atmosphere, \({O_3}\) from \({O_2}\) by lightning

Evaporation of \({H_2}O\)

Nitrogen oxides form nitrogen and oxygen by lightning

Questions 11 of 50

Question:Equation \({H_2}S + {H_2}{O_2} \to S + 2{H_2}O\) represents

Answers Choices:

Acidic nature of\({H_2}{O_2}\)

Basic nature of \({H_2}{O_2}\)

Oxidising nature of \({H_2}{O_2}\)

Reducing nature of \({H_2}{O_2}\)

Questions 12 of 50

Question:In the reaction \({C_2}O_4^{2 - } + MnO_4^ - + {H^ + }\, \to \,M{n^{2 + }} + C{O_2} + {H_2}O\) the reductant is

Answers Choices:

\({C_2}O_4^{2 - }\)

\(MnO_4^ - \)

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

\({H^ + }\)

Questions 13 of 50

Question:A solution of sulphur dioxide in water reacts with \({H_2}S\) precipitating sulphur. Here sulphur dioxide acts as

Answers Choices:

As oxidising agent

A reducing agent

An acid

A catalyst

Questions 14 of 50

Question:Which of these substances is a good reducing agent

Answers Choices:

\(NaOCl\)

\(HI\)

\(FeC{l_3}\)

\(KBr\)

Questions 15 of 50

Question:The strongest reducing agent is

Answers Choices:

\(HN{O_2}\)

\({H_2}S\)

\({H_2}S{O_3}\)

\(SnC{l_2}\)

Questions 16 of 50

Question:Which one is an oxidising agent

Answers Choices:

\(FeS{O_4}\)

\(HN{O_3}\)

\(FeS{O_4}.{(N{H_4})_2}S{O_4}.6{H_2}O\)

\({H_2}S{O_4}\)

2 and 4 are correct

Questions 17 of 50

Question:Which of the following substances acts as an oxidising as well as a reducing agent

Answers Choices:

\(N{a_2}O\)

\(SnC{l_2}\)

\(N{a_2}{O_2}\)

\(NaN{O_2}\)

Questions 18 of 50

Question:In the reaction \(P + NaOH \to P{H_3} + Na{H_2}P{O_2}\)

Answers Choices:

P is oxidised only

P is reduced only

P is oxidized as well as reduced

\(Na\) is reduced

Questions 19 of 50

Question:The oxidation number of C in \(C{O_2}\) is

Answers Choices:

2

2

4

4

Questions 20 of 50

Question:The oxidation number of \(As\) is

Answers Choices:

+ 2 and + 3

+ 3 and + 5

+ 3 and + 4

None of these

Questions 21 of 50

Question:Oxidation number of nickel in \(Ni{(CO)_4}\)

Answers Choices:

0

4

4

2

Questions 22 of 50

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

Answers Choices:

2

2

4

6

Questions 23 of 50

Question:Oxidation state of chlorine in perchloric acid is

Answers Choices:

1

0

7

7

Questions 24 of 50

Question:Oxidation number of \(N\) in \(HN{O_3}\) is

Answers Choices:

3.5

3.5

3, +5

5

Questions 25 of 50

Question:The oxidation number of S in \({H_2}{S_2}{O_8}\) is

Answers Choices:

+2

+4

+6

+7

Questions 26 of 50

Question:The oxidation state of nitrogen in \({N_3}H\) is

Answers Choices:

\( + \frac{1}{3}\)

3

\( - 1\)

\( - \frac{1}{3}\)

Questions 27 of 50

Question:Which of the following statements is correct

Answers Choices:

Hydrogen has oxidation number \( - 1\) and \( + \,1\)

Hydrogen has same electronegativity as halogens

Hydrogen will not be liberated at anode

Hydrogen has same ionization potential as alkali metals

Questions 28 of 50

Question:The oxidation state of \(Cr\) in \({[Cr{(N{H_3})_4}C{l_2}]^ + }\) is

Answers Choices:

3

2

1

0

Questions 29 of 50

Question:If \(HN{O_3}\) changes into \({N_2}O\) , the oxidation number is changed by

Answers Choices:

2

1

0

4

Questions 30 of 50

Question:The characteristic oxidation number of atoms in free metals is

Answers Choices:

Minus one

Any number

One

Zero

Questions 31 of 50

Question:In which one of the following changes there are transfer of five electrons

Answers Choices:

\(MnO_4^ - \to \,M{n^{2 + }}\)

\(CrO_4^2 \to \,C{r^{3 + }}\)

\(MnO_4^{2 - } \to \,Mn{O_2}\)

\(C{r_2}O_7^{2 - }\, \to \,2C{r^{3 + }}\)

Questions 32 of 50

Question:Oxidation number of \(C\) in \({C_6}{H_{12}}{O_6}\) is

Answers Choices:

6

6

0

4

Questions 33 of 50

Question:The oxidation number of iron in the compound \({K_4}[Fe{(CN)_6}]\) is

Answers Choices:

6

4

3

2

Questions 34 of 50

Question:The brown ring complex compound is formulated as \([Fe{({H_2}O)_5}NO]\,S{O_4}.\) The oxidation state of iron is

Answers Choices:

1

2

3

0

Questions 35 of 50

Question:Oxidation state of oxygen in \({F_2}O\) is

Answers Choices:

1

2

\( - 1\)

\( - 2\)

Questions 36 of 50

Question:Phosphorus has the oxidation state of +3 in

Answers Choices:

Orthophosphoric acid

Phosphorus acid

Metaphosphoric acid

Pyrophosphoric acid

Questions 37 of 50

Question:Oxidation number of As atoms in \({H_3}As{O_4}\)is

Answers Choices:

3

4

6

5

Questions 38 of 50

Question:In \(Xe{O_3}\) and \(Xe{F_6}\) the oxidation state of Xe is

Answers Choices:

4

6

1

3

Questions 39 of 50

Question:Oxidation number of carbon in \(C{H_3} - Cl\) is

Answers Choices:

3

2

1

0

Questions 40 of 50

Question:The oxidation state of \(Cr\) in \(C{r_2}O_7^{2 - }\) is

Answers Choices:

4

6

6

2

Questions 41 of 50

Question:The oxidation number of \(N\) in \(N{H_4}Cl\) is

Answers Choices:

5

3

5

3

Questions 42 of 50

Question:In which reaction there is a change in valency

Answers Choices:

\(2N{O_2}\, \to \,\,{N_2}{O_4}\)

\(2N{O_2} + {H_2}O\, \to \,HN{O_2} + HN{O_3}\)

\(N{H_4}OH\, \to \,NH_4^ + + O{H^ - }\)

\(CaC{O_3}\, \to \,CaO + C{O_2}\)

Questions 43 of 50

Question:Oxidation state of \(Fe\) in \(F{e_3}{O_4}\) is

Answers Choices:

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

\(\frac{4}{5}\)

\(\frac{5}{4}\)

\(\frac{8}{3}\)

Questions 44 of 50

Question:Nitrogen show different oxidation states in the range

Answers Choices:

0 to +5

3 to + 5

5 to + 3

3 to + 3

Questions 45 of 50

Question:Oxidation number of S in \(SO_4^{2 - }\)

Answers Choices:

6

3

2

2

Questions 46 of 50

Question:The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is

Answers Choices:

4

6

2

3

Questions 47 of 50

Question:The oxidation state of I in \(IP{O_4}\) is

Answers Choices:

1

3

5

7

Questions 48 of 50

Question:The number of moles of \(KMn{O_4}\) reduced by one mole of KI in alkaline medium is:

Answers Choices:

One fifth

five

One

Two

Questions 49 of 50

Question:In the equation \({H_2}S + 2HN{O_3} \to 2{H_2}O + 2N{O_2} + S\). The equivalent weight of hydrogen sulphide is

Answers Choices:

16

68

34

17

Questions 50 of 50

Question:If 1.2 g of metal displace 1.12 litre hydrogen at normal temperature and pressure ,equivalent weight of metal would be

Answers Choices:

24

12

1.2 /11.2

1.2 x 11.2