# 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

Oxidation

Reduction

Oxidation and reduction (Redox)

Neutralization

## Questions 2 of 50

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

$$F{e^{ + 2}}$$ 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

Oxidised

Reduced

Precipitated

None of these

## Questions 4 of 50

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

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

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

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

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

$$SO_4^{2 - }$$

$${S_4}O_6^{2 - }$$

$${S_2}O_6^{2 - }$$

## Questions 8 of 50

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

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

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

$${H_2}S{O_4}$$ 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

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

$${C_2}O_4^{2 - }$$

$$MnO_4^ -$$

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

$${H^ + }$$

## Questions 13 of 50

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

As oxidising agent

A reducing agent

An acid

A catalyst

## Questions 14 of 50

Question:Which of these substances is a good reducing agent

$$NaOCl$$

$$HI$$

$$FeC{l_3}$$

$$KBr$$

## Questions 15 of 50

Question:The strongest reducing agent is

$$HN{O_2}$$

$${H_2}S$$

$${H_2}S{O_3}$$

$$SnC{l_2}$$

## Questions 16 of 50

Question:Which one is an oxidising agent

$$FeS{O_4}$$

$$HN{O_3}$$

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

$${H_2}S{O_4}$$

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

$$N{a_2}O$$

$$SnC{l_2}$$

$$N{a_2}{O_2}$$

$$NaN{O_2}$$

## Questions 18 of 50

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

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

2

2

4

4

## Questions 20 of 50

Question:The oxidation number of $$As$$ is

+ 2 and + 3

+ 3 and + 5

+ 3 and + 4

None of these

## Questions 21 of 50

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

0

4

4

2

## Questions 22 of 50

Question:The oxidation number of sulphur in $${H_2}S{O_4}$$ is

2

2

4

6

## Questions 23 of 50

Question:Oxidation state of chlorine in perchloric acid is

1

0

7

7

## Questions 24 of 50

Question:Oxidation number of $$N$$ in $$HN{O_3}$$ is

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

+2

+4

+6

+7

## Questions 26 of 50

Question:The oxidation state of nitrogen in $${N_3}H$$ is

$$+ \frac{1}{3}$$

3

$$- 1$$

$$- \frac{1}{3}$$

## Questions 27 of 50

Question:Which of the following statements is correct

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

3

2

1

0

## Questions 29 of 50

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

2

1

0

4

## Questions 30 of 50

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

Minus one

Any number

One

Zero

## Questions 31 of 50

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

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

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

$$MnO_4^{2 - } \to \,Mn{O_2}$$

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

## Questions 32 of 50

Question:Oxidation number of $$C$$ in $${C_6}{H_{12}}{O_6}$$ is

6

6

0

4

## Questions 33 of 50

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

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

1

2

3

0

## Questions 35 of 50

Question:Oxidation state of oxygen in $${F_2}O$$ is

1

2

$$- 1$$

$$- 2$$

## Questions 36 of 50

Question:Phosphorus has the oxidation state of +3 in

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

3

4

6

5

## Questions 38 of 50

Question:In $$Xe{O_3}$$ and $$Xe{F_6}$$ the oxidation state of Xe is

4

6

1

3

## Questions 39 of 50

Question:Oxidation number of carbon in $$C{H_3} - Cl$$ is

3

2

1

0

## Questions 40 of 50

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

4

6

6

2

## Questions 41 of 50

Question:The oxidation number of $$N$$ in $$N{H_4}Cl$$ is

5

3

5

3

## Questions 42 of 50

Question:In which reaction there is a change in valency

$$2N{O_2}\, \to \,\,{N_2}{O_4}$$

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

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

$$CaC{O_3}\, \to \,CaO + C{O_2}$$

## Questions 43 of 50

Question:Oxidation state of $$Fe$$ in $$F{e_3}{O_4}$$ is

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

$$\frac{4}{5}$$

$$\frac{5}{4}$$

$$\frac{8}{3}$$

## Questions 44 of 50

Question:Nitrogen show different oxidation states in the range

0 to +5

3 to + 5

5 to + 3

3 to + 3

## Questions 45 of 50

Question:Oxidation number of S in $$SO_4^{2 - }$$

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

4

6

2

3

## Questions 47 of 50

Question:The oxidation state of I in $$IP{O_4}$$ is

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:

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

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