Redox Reaction Test 3

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:Max. number of moles of electrons taken up by one mole of \(NO_3^ - \) when it is reduced to

Answers Choices:

\(N{H_3}\)

\(N{H_2}OH\)

\(NO\)

\(N{O_2}\)

Questions 2 of 50

Question:In the reaction \(3Mg + {N_2} \to M{g_3}{N_2}\)

Answers Choices:

Magnesium is reduced

Magnesium is oxidized

Nitrogen is oxidized

None of these

Questions 3 of 50

Question:When sodium metal is dissolved in liquid ammonia, blue colour solution is formed. The blue colour is due to

Answers Choices:

Solvated \(N{a^ + }\)ions

Solvated electrons

Solvated \(NH_2^ - \) ions

Solvated protons

Questions 4 of 50

Question:Following reaction describes the rusting of iron \(4Fe + 3{O_2}\, \to \,4F{e^{3 + }} + 6{O^{2 - }}\). Which one of the following statement is incorrect

Answers Choices:

This is an example of a redox reaction

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

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

Metallic iron is a reducing agent

Questions 5 of 50

Question:In the following reaction, \(3B{r_2} + 6CO_3^{2 - } + 3{H_2}O = 5B{r^ - } + BrO_3^ - + 6HC{O_3}\)

Answers Choices:

Bromine is oxidised and carbonate is reduced

Bromine is reduced and water is oxidized

Bromine is neither reduced nor oxidized

Bromine is both reduced and oxidized

Questions 6 of 50

Question:In the following reaction, \(4P + 3KOH + 3{H_2}O \to 3K{H_2}P{O_2} + P{H_3}\)

Answers Choices:

P is oxidized as well as reduced

P is reduced only

P is oxidised only

None of these

Questions 7 of 50

Question:In the following reaction \(C{r_2}O_7^ - + 14{H^ + } + 6{I^ - } \to \,\) \(2C{r^{3 + }} + 3{H_2}O + 3{I_2}\) Which element is reduced

Answers Choices:

\(Cr\)

\(H\)

\(O\)

\(I\)

Questions 8 of 50

Question:The conversion of sugar \({C_{12}}{H_{22}}{O_{11}}\, \to \,\,C{O_2}\) is

Answers Choices:

Oxidation

Reduction

Neither oxidation nor reduction

Both oxidation and reduction

Questions 9 of 50

Question:Several blocks of magnesium are fixed to the bottom of a ship to

Answers Choices:

Keep away the sharks

Make the ship lighter

Prevent action of water and salt

Prevent puncturing by under-sea rocks

Questions 10 of 50

Question:Which of the following behaves as both oxidising and reducing agents

Answers Choices:

\({H_2}S{O_4}\)

\(S{O_2}\)

\({H_2}S\)

\(HN{O_3}\)

Questions 11 of 50

Question:The reaction \({H_2}S + {H_2}{O_2} \to 2{H_2}O + S\) shows

Answers Choices:

Oxidizing action of \({H_2}{O_2}\)

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

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

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

Questions 12 of 50

Question:Which of the following is not a reducing agent

Answers Choices:

\(NaN{O_2}\)

\(NaN{O_3}\)

\(HI\)

\(SnC{l_2}\)

Questions 13 of 50

Question:Which of the following acid possesses oxidising, reducing and complex forming properties

Answers Choices:

\(HN{O_3}\)

\({H_2}S{O_4}\)

\(HCl\)

\(HN{O_2}\)

Questions 14 of 50

Question:Which one is oxidising substance

Answers Choices:

\({C_2}{H_2}{O_2}\)

\(CO\)

\({H_2}S\)

\(C{O_2}\)

Questions 15 of 50

Question:The compound that can work both as oxidising and reducing agent is

Answers Choices:

\(KMn{O_4}\)

\({H_2}{O_2}\)

\(Ba{O_2}\)

\({K_2}C{r_2}{O_7}\)

Questions 16 of 50

Question:Which one is oxidising agent in the reaction below \(2CrO_4^{2 - } + 2{H^ + } \to C{r_2}O_7^{2 - } + {H_2}O\)

Answers Choices:

\({H^ + }\)

\(C{r_2}O_4^ - \)

\(C{r^{ + + }}\)

None of these

Questions 17 of 50

Question:In the conversion \(B{r_2}\, \to \,BrO_3^ - ,\) the oxidation state of bromine changes from

Answers Choices:

1 to – 1

0 to – 1

0 to + 5

0 to – 5

Questions 18 of 50

Question:In the chemical reaction \(C{l_2} + {H_2}S \to 2HCl + S\) , the oxidation number of sulphur changes from

Answers Choices:

0 to 2

2 to 0

2 to 0

2 to – 1

Questions 19 of 50

Question:Oxidation number of cobalt in \(K[Co{(CO)_4}]\) is

Answers Choices:

1

3

1

3

Questions 20 of 50

Question:When \({K_2}C{r_2}{O_7}\) is converted to \({K_2}Cr{O_4},\) the change in the oxidation state of chromium is

Answers Choices:

0

6

4

3

Questions 21 of 50

Question:Maximum oxidation state of Cr is

Answers Choices:

3

4

6

7

Questions 22 of 50

Question:In which of the following compound transition metal has zero oxidation state

Answers Choices:

\(Cr{O_5}\)

\(N{H_2}.N{H_2}\)

\(NOCl{O_4}\)

\([Fe{(CO)_5}]\)

Questions 23 of 50

Question:Carbon is in the lowest oxidation state in

Answers Choices:

\(C{H_4}\)

\(CC{l_4}\)

\(C{F_4}\)

\(C{O_2}\)

Questions 24 of 50

Question:Oxidation number of carbon in \({H_2}{C_2}{O_4}\) is

Answers Choices:

4

3

2

2

Questions 25 of 50

Question:The sum of the oxidation numbers of all the carbons in \({C_6}{H_5}CHO\) is

Answers Choices:

2

0

4

4

Questions 26 of 50

Question:Which one of the following has the highest oxidation number of iodine

Answers Choices:

\(K{I_3}\)

\(KI\)

\(I{F_5}\)

\(KI{O_4}\)

Questions 27 of 50

Question:The oxidation number of N in \({N_2}H_5^ + \)

Answers Choices:

3

(– 2)

1

2

Questions 28 of 50

Question:In which of the following compounds the oxidation number of carbon is maximum

Answers Choices:

\(HCHO\)

\(CHC{l_3}\)

\(C{H_3}OH\)

\({C_{12}}{H_{22}}{O_{11}}\)

Questions 29 of 50

Question:The oxidation states of the most electronegative element in the products of the reaction of \(Ba{O_2}\)with dilute \({H_2}S{O_4}\) are

Answers Choices:

0 and – 1

1 and – 2

2 and 0

2 and + 1

Questions 30 of 50

Question:The highest oxidation state of \(Mn\) is shown by

Answers Choices:

\({K_2}Mn{O_4}\)

\(KMn{O_4}\)

\(Mn{O_2}\)

\(M{n_2}{O_2}\)

\(MnO\)

Questions 31 of 50

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

Answers Choices:

2

2

0

4

Questions 32 of 50

Question:Sulphur has lowest oxidation number in

Answers Choices:

\({H_2}S{O_3}\)

\(S{O_2}\)

\({H_2}S{O_4}\)

\(Ca,\,\,K,\,\,Li\)

Questions 33 of 50

Question:The oxidation number and covalency of sulphur in the sulphur molecule \(({S_8})\) are respectively

Answers Choices:

0 and 2

6 and 8

0 and 8

6 and 2

Questions 34 of 50

Question:In ferrous ammonium sulphate oxidation number of \(Fe\) is

Answers Choices:

3

2

1

2

Questions 35 of 50

Question:When \(KMn{O_4}\) is reduced with oxalic acid in acidic solution, the oxidation number of \(Mn\) changes from

Answers Choices:

7 to 4

6 to 4

7 to 2

4 to 2

Questions 36 of 50

Question:Oxygen has oxidation states of +2 in the

Answers Choices:

\({H_2}{O_2}\)

\(C{O_2}\)

\({H_2}O\)

\(O{F_2}\)

Questions 37 of 50

Question:The element exhibiting most stable \( + \,2\) oxidation state among the following is

Answers Choices:

\(Ag\)

\(Fe\)

\(Sn\)

\(Pb\)

Questions 38 of 50

Question:Oxidation number of sulphur in \({S_2}O_3^{2 - }\)is

Answers Choices:

2

2

6

0

Questions 39 of 50

Question:The oxidation number of nickel in \({K_4}[Ni{(CN)_4}]\) is

Answers Choices:

2

1

2

0

Questions 40 of 50

Question:The oxidation number of fluorine in \({F_2}O\) is

Answers Choices:

1

1

2

2

Questions 41 of 50

Question:Oxidation number of \(Fe\) in \({K_3}[Fe{(CN)_6}]\) is

Answers Choices:

2

3

1

4

Questions 42 of 50

Question:Oxidation number of \(N\) in \(N{H_3}\) is

Answers Choices:

3

3

0

5

Questions 43 of 50

Question:Starch paper is used to test for the presence of

Answers Choices:

Iodine

Oxidising agent

Iodide ion

Reducing agent

Questions 44 of 50

Question:How many moles of \({K_2}C{r_2}{O_7}\) can be reduced by 1 mole of \(S{n^{2 + }}\)

Answers Choices:

1/3

1/6

2/3

1

Questions 45 of 50

Question:\(2MnO_4^ - + 5{H_2}{O_2} + 6{H^ + } \to 2\,\,Z + 5{O_2} + 8{H_2}O\). In this reaction Z is

Answers Choices:

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

\(M{n^{ + 4}}\)

\(Mn{O_2}^{}\)

\(Mn\)

Questions 46 of 50

Question:What is 'A' in the following reaction \(2F{e^{3 + }}_{(aq)} + S{n^{2 + }}_{(aq)} \to 2F{e^{2 + }}_{(aq)} + A\)

Answers Choices:

\(S{n^{3 + }}_{(aq)}\)

\(S{n^{4 + }}_{(aq)}\)

\(S{n^{2 + }}_{(aq)}\)

Sn

Questions 47 of 50

Question:In which of the following reactions there is no change in valency

Answers Choices:

\(4KCl{O_3}\, \to \,3KCl{O_4} + KCl\)

\(C{l_2}\)

\(Ba{O_2} + {H_2}S{O_4}\, \to \,\,BaS{O_4} + {H_2}{O_2}\)

\(2BaO + {O_2}\, \to \,2Ba{O_2}\)

Questions 48 of 50

Question:The equivalent weight of phosphoric acid \(({H_3}P{O_4})\) in the reaction \(NaOH + {H_3}P{O_4} \to Na{H_2}P{O_4} + {H_2}O\) is

Answers Choices:

25

49

59

98

Questions 49 of 50

Question:What is the equivalent mass of \(IO_4^ - \) when it is converted into \({I_2}\) in acid medium

Answers Choices:

M/6

M/7

M/5

M/4

None of these

Questions 50 of 50

Question:For decolourization of 1 mole of \(KMn{O_4}\) , the moles of \({H_2}{O_2}\) required is

Answers Choices:

1/2

3/2

5/2

7/2