Redox Reaction Test 2

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:In the course of a chemical reaction an oxidant

Answers Choices:

Loses electrons

Gains electrons

Both loses and gains electron

Electron change takes place

Questions 2 of 50

Question:\(2CuI\, \to Cu + Cu{I_2}\), the reaction is

Answers Choices:

Redox

Neutralisation

Oxidation

Reduction

Questions 3 of 50

Question:\({H_2}S\) reacts with halogens, the halogens

Answers Choices:

Form sulphur halides

Are oxidized

Are reduced

None of these

Questions 4 of 50

Question:\({H_2}{O_2}\)reduces \({K_4}Fe{(CN)_6}\)

Answers Choices:

In neutral solution

In acidic solution

In non-polar solvent

In alkaline solution

Questions 5 of 50

Question:One gas bleaches the colour of flowers by reduction while the other by oxidation

Answers Choices:

\(CO\) and \(C{l_2}\)

\(S{O_2}\) and \(C{l_2}\)

\({H_2}S\) and \(B{r_2}\)

\(N{H_3}\) and \(S{O_2}\)

Questions 6 of 50

Question:Reduction involves

Answers Choices:

Loss of electrons

Gain of electrons

Increase in the valency of positive part

Decrease in the valency of negative part

Questions 7 of 50

Question:In a reaction between zinc and iodine, in which zinc iodide is formed, what is being oxidized

Answers Choices:

Zinc ions

Iodide ions

Zinc atom

Iodine

Questions 8 of 50

Question:Which one of the following reactions does not involve either oxidation or reduction

Answers Choices:

\(VO_2^ + \, \to \,{V_2}{O_3}\)

\(Na\, \to \,N{a^ + }\)

\(CrO_4^{2 - }\, \to \,C{r_2}O_7^{2 - }\)

\(Z{n^{2 + }}\, \to \,Zn\)

Questions 9 of 50

Question:A reducing agent is a substance which can

Answers Choices:

Accept electron

Donate electrons

Accept protons

Donate protons

Questions 10 of 50

Question:Which of the following is the most powerful oxidizing agent

Answers Choices:

\({F_2}\)

\(C{l_2}\)

\(B{r_2}\)

\({I_2}\)

Questions 11 of 50

Question:Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is

Answers Choices:

\(HCl{O_4}\)

\(HCl{O_3}\)

\(HCl{O_2}\)

\(HOCl\)

Questions 12 of 50

Question:Identify the correct statement about \({H_2}{O_2}\)

Answers Choices:

It acts as reducing agent only

It acts as both oxidising and reducing agent

It is neither an oxidiser nor reducer

It acts as oxidising agent only

Questions 13 of 50

Question:In which of the following reactions \({H_2}{O_2}\) is a reducing agent

Answers Choices:

\(2FeC{l_2} + 2HCl + {H_2}{O_2}\, \to \,2FeC{l_3} + 2{H_2}O\)

\(C{l_2} + {H_2}{O_2}\,\, \to \,\,2HCl + {O_2}\)

\(2HI + {H_2}{O_2}\, \to \,\,2{H_2}O + {I_2}\)

\({H_2}S{O_3} + {H_2}{O_2}\, \to \,\,{H_2}S{O_4} + {H_2}O\)

Questions 14 of 50

Question:When \(NaCl\) is dissolved in water the sodium ion becomes

Answers Choices:

Oxidised

Reduced

Hydrolysed

Hydrated

Questions 15 of 50

Question:Strongest reducing agent is

Answers Choices:

\(K\)

\(Mg\)

\(Al\)

\(Br\)

\(Na\)

Questions 16 of 50

Question:Which substance is serving as a reducing agent in the following reaction \(14{H^ + } + C{r_2}O_7^{2 - } + 3Ni \to 2C{r^{3 + }} + 7{H_2}O + 3N{i^{2 + }}\)

Answers Choices:

\({H_2}O\)

\(Ni\)

\({H^ + }\)

\(C{r_2}O_7^{2 - }\)

Questions 17 of 50

Question:The oxidation number of Ba in barium peroxide is

Answers Choices:

6

2

1

4

Questions 18 of 50

Question:\(HN{O_2}\) acts both as reductant and oxidant, while \(HN{O_3}\) acts only as oxidant. It is due to their

Answers Choices:

Solubility ability

Maximum oxidation number

Minimum oxidation number

Minimum number of valence electrons

Questions 19 of 50

Question:Chlorine is in +1 oxidation state in

Answers Choices:

\(HCl\)

\(HCl{O_4}\)

\(ICl\)

\(C{l_2}O\)

Questions 20 of 50

Question:The valency of Cr in the complex \({[Cr{({H_2}O)_4}C{l_2}]^ + }\)

Answers Choices:

1

3

5

6

Questions 21 of 50

Question:The oxidation number of \(Mn\) in \(MnO_4^{ - 1}\) is

Answers Choices:

7

5

6

5

Questions 22 of 50

Question:\(S{n^{ + + }}\) loses two electrons in a reaction. What will be the oxidation number of tin after the reaction

Answers Choices:

2

Zero

4

2

Questions 23 of 50

Question:The oxidation state of \(Mn\) in \({K_2}Mn{O_4}\)

Answers Choices:

2

7

2

6

Questions 24 of 50

Question:Oxidation number of oxygen in \({O_2}\) molecule is

Answers Choices:

1

0

2

2

Questions 25 of 50

Question:Sulphur has highest oxidation state in

Answers Choices:

\(S{O_2}\)

\({H_2}S{O_4}\)

\(N{a_2}{S_2}{O_3}\)

\(N{a_2}{S_4}{O_6}\)

Questions 26 of 50

Question:The oxidation number of \(Fe\) and \(S\) in iron pyrites are

Answers Choices:

4, – 2

2, – 1

3, – 1.5

3, – 1

Questions 27 of 50

Question:The oxidation number of nitrogen in \(NO_3^ - \) is

Answers Choices:

1

2

3

5

Questions 28 of 50

Question:Oxidation state of elemental carbon is

Answers Choices:

0

1

2

3

Questions 29 of 50

Question:In which of the following compounds iron has lowest oxidation state

Answers Choices:

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

\({K_4}Fe{(CN)_6}\)

\(Fe{(CO)_5}\)

\(F{e_2}O\)

\({K_2}Fe{O_4}\)

Questions 30 of 50

Question:The oxidation number of hydrogen in \(M{H_2}\) is

Answers Choices:

1

1

2

2

Questions 31 of 50

Question:Oxidation number of iodine varies from

Answers Choices:

1 to +1

1 to +7

+3 to +5

1 to +5

Questions 32 of 50

Question:When \(S{O_2}\) is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chromium is

Answers Choices:

+4 to +2

+5 to +3

+6 to +3

+7 to +2

Questions 33 of 50

Question:Oxidation number of \(P\) in \(M{g_2}{P_2}{O_7}\) is

Answers Choices:

3

2

5

3

Questions 34 of 50

Question:The oxidation state of nitrogen is highest in

Answers Choices:

\({N_3}H\)

\(N{H_2}OH\)

\({N_2}{H_4}\)

\(N{H_3}\)

Questions 35 of 50

Question:Oxidation number of \(P\) in \(K{H_2}P{O_2}\) is

Answers Choices:

1

3

5

4

Questions 36 of 50

Question:The most common oxidation state of an element is -2. The number of electrons present in its outermost shell is

Answers Choices:

4

2

6

8

Questions 37 of 50

Question:Oxidation state of 'S' in \({H_2}S{O_3}\)

Answers Choices:

3

6

4

2

Questions 38 of 50

Question:Oxidation numbers of two \(Cl\) atoms in bleaching powder, \(CaOC{l_2}\) are

Answers Choices:

1, – 1

+ 1, – 1

+ 1, + 1

0, – 1

Questions 39 of 50

Question:Select the compound in which chlorine is assigned the oxidation number +5

Answers Choices:

\(HCl{O_4}\)

\(HCl{O_2}\)

\(HCl{O_3}\)

\(HCl\)

Questions 40 of 50

Question:Oxidation number of \(Mn\) in \({K_2}Mn{O_4}\) and \(MnS{O_4}\) are respectively

Answers Choices:

+ 7, + 2

+ 6, + 2

+ 5, + 2

+ 2, + 6

Questions 41 of 50

Question:Identify the element which can have highest oxidation numbers

Answers Choices:

\(N\)

\(O\)

\(Cl\)

\(C\)

Questions 42 of 50

Question:What is the oxidation number of Co in \([Co{(N{H_3})_4}ClN{O_2}]\)

Answers Choices:

2

3

4

5

Questions 43 of 50

Question:The value of \(x\) in the partial redox equation \(MnO_4^ - + 8{H^ + } + xe\) \(\leftrightarrow \) \(M{n^{2 + }} + 4{H_2}O\) is

Answers Choices:

5

3

1

0

Questions 44 of 50

Question:\({C_2}{H_6}(g) + n{O_2}\, \to \,C{O_2}\,(g) + {H_2}O\,(l)\) In this equation, the ratio of the coefficients of \(C{O_2}\) and \({H_2}O\) is

Answers Choices:

1:01

2:03

3:02

1:03

Questions 45 of 50

Question:The number of electrons involved in the reduction of \(C{r_2}O_7^{2 - }\) in acidic solution to \(C{r^{3 + }}\) is

Answers Choices:

0

2

3

5

Questions 46 of 50

Question:When \(KMn{O_4}\) acts as an oxidising agent and ultimately forms \({[\,Mn{O_4}]^{ - 2}},\,\,Mn{O_2},\,\,\,M{n_2}{O_3},\,\,M{n^{ + 2}}\) then the number of electrons transferred in each case respectively is

Answers Choices:

4, 3, 1, 5

1, 5, 3, 7

1, 3, 4, 5

3, 5, 7, 1

Questions 47 of 50

Question:Which one of the following nitrates will leave behind a metal on strong heating

Answers Choices:

Ferric nitrate

Copper nitrate

Manganese nitrate

Silver nitrate

Questions 48 of 50

Question:To prevent rancidification of food material, which of the following is added

Answers Choices:

Reducing agent

Anti-oxidant

Oxidising agent

None of these

Questions 49 of 50

Question:Prevention of corrosion of iron by zinc coating is called

Answers Choices:

Galvanization

Cathodic protection

Electrolysis

Photo–electrolysis

Questions 50 of 50

Question:The metal used in galvanizing of iron is

Answers Choices:

\(Pb\)

\(Zn\)

\(Al\)

\(Sn\)