Redox Reactions Test

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Redox Reactions Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

The oxidation number of sulphur in $$ \mathrm{S}_{8}, \mathrm{S}_{2} \mathrm{F}_{2}, \mathrm{H}_{2} \mathrm{S} $$ respectively, are

A
$$ 0,+1 $$ and -2

B
$$ +2,+1 $$ and -2

C
$$ 0,+1 $$ and +2

D
$$ -2,+1 $$ and -2

Solution

a. $$ 0,+1 $$ and -2
Question 2
1 / -0

A metal ion $$ M^{3+} $$ loses 3 electrons, its oxidation number will be

A
$$ +3 $$

B
$$ +6 $$

C
$$ 0 $$

D
$$ -3 $$

Solution

$$ \mathrm{M}^{3+} \rightarrow \mathrm{M}^{6+}+3 e^{-} $$
Question 3
1 / -0

Which of the following statements is correct?

A
Hydrogen has the same ionization potential as alkali metals

B
$$H^-$$ has more electronegativity as halogens

C
$$H^-$$ has oxidation number of $$-1$$

D
$$H^-$$ will Dot be liberated at the anode.

Solution

The only correct statement of the given statements is statement "C".
Hence, Option "C" is the correct answer.
Question 4
1 / -0

The oxidation number of carbon in $$ \mathrm{CH}_{2} \mathrm{Cl}_{2} $$ is

A
0

B
2

C
3

D
5

Solution

0
Question 5
1 / -0

$$1$$ mol of ferric oxalate is oxidised completely by $$x$$ mol of $$MnO_{4}^{-}$$ in acidic medium. Then, $$x$$ is :

A
$$1.2$$

B
$$1.6$$

C
$$1.8$$

D
$$1.5$$

Solution

The reaction involved is shown below:
$$Fe_{2}(C_{2}O_{4})_{3}\rightarrow 2Fe^{3+}+3C_{2}O_{4}^{2-}$$
$$3 (C^{3+})_{2}\rightarrow 6C^{4+}+6e^{-}$$
$$Mn^{7+}+5e^{-}\rightarrow Mn^{2+}$$
$$6$$ mol of $$Mn^{7+}$$ needs $$15$$ mol of $$C_{2}O_{4}^{2-}$$ or $$5$$ mol of $$Fe_{2}(C_{2}O_{4})_{3}$$.
Therefore, $$1$$ mol will require $$\dfrac{6}{5}$$ $$=$$ $$1.2$$.
Question 6
1 / -0

When $$K_{2}Cr_{2}O_{7}$$ is mixed with $$H_{2}SO_{4}$$ and thoroughly shaken with $$H_{2}O_{2}$$ in presence of ether, then a floated blue coloured complex $$X$$ is formed. The change in oxidation state and the percentage of $$Cr$$ in the complex $$X$$ is:

A
$$+6, 49.4$$

B
$$+4, 39.4$$

C
$$0, 39.4$$

D
$$+4, 59.4$$

Solution

When $$K_2Cr_2O_7$$ reacts with $$H_2O_2$$, a blue colored compound is formed which is $$CrO_5$$.

The oxidation number of $$Cr$$ in $$CrO_5$$ is $$+6$$, because four of oxygen atoms are involved in peroxide linkage.

So, change in oxidation state from $$K_2Cr_2O_7$$ to $$CrO_5$$ is $$0$$.

The percentage of chromium in the complex is $$\dfrac { 52 }{ 132 } \times 100=39.4$$%.

The structure of $$CrO_5$$ is shown above.
Question 7
1 / -0

List - I
(Compound)
List - II
(Oxidation no of sulphur)
A) $$H_{2}S_{2}O_{8}$$
1) + 1
B)$$H_{2}S$$
2) + 2
C) $$Na_{2}SO_{3}$$
3) + 6
D) $$S_{2}Cl_{2}$$
4) + 4

5) -2

A
A - 3, B - 5, C - 4, D - 2

B
A - 3, B - 5, C - 4, D - 1

C
A - 6, B - 5, C - 4, D - 2

D
A - 6, B - 4, C - 5, D - 1

Solution

$$H_2S_2O_8$$ contains a peroxide linkage in which each oxygen has oxidation number of -1. The oxidation number of remaining oxygen atoms is -2. The oxidation number of hydrogen is +1. Hence, the oxidation number of sulphur is +6.
In $$H_2S$$, the oxidation number of hydrogen is +1 and that of sulfur is -2.
In $$Na_2S_2O_3$$, the oxidation numbers of sodium, sulphur and oxygen are +1, +4 and -2 respectively.
In $$S_2Cl_2$$, the oxidation number of Sulphur and chlorine are +1 and -1 respectively.
Question 8
1 / -0

Which of the following is not a redox reaction?

A
$$ {Mg} + {N}_{2} \rightarrow {Mg}_{3}{N}_{2} $$

B
$$ {MnO}^{-}_{4} + {C}_{2}{O}^{2-}_{4} \rightarrow {Mn}^{2+} + {CO}_{2} $$

C
$$ CuS{O}_{4} + KI \rightarrow 2CuI + {I}_{2} + {K}_{2}S{O}_{4} $$

D
$$ AgCl + {NH}_{3} \rightarrow [Ag({NH}_{3})_{2}]Cl $$

Solution

$$ AgCl + {NH}_{3} \rightarrow [Ag({NH}_{3})_{2}]Cl $$ is not a redox reaction because there is no change in oxidation number of any element.
Question 9
1 / -0

Oxidation states of the metal in the minerals haematite and magnetite, respectively are:

A
II, III in haematite and III in magnetite

B
II, III in haematite and II in magnetite

C
II in haematite and II, III in magnetite

D
III in haematite and II, III in magnetite

Solution

In haematite $$(Fe_2O_3)$$, Fe is present in (III) oxidation state and in magnetite $$(Fe_3O_4)$$, Fe is present in (II) and (III) oxidation state.
Question 10
1 / -0

Identity the pair of binary corresponds in which nitrogen exhibits the lowest and the highest oxidation state.

A
$$NH_{3}$$, $$NO_{2}$$

B
$$NH_3$$, $$N_{2}O_{5}$$

C
$$N_{2}$$, $$HNO_{3}$$

D
$$N_{2}O$$, $$N_{2}O_{5}$$

Solution

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Re-Attempt Weekly Quiz Competition

List - I (Compound)	List - II (Oxidation no of sulphur)
A) $$H_{2}S_{2}O_{8}$$	1) + 1
B)$$H_{2}S$$	2) + 2
C) $$Na_{2}SO_{3}$$	3) + 6
D) $$S_{2}Cl_{2}$$	4) + 4
	5) -2

Redox Reactions Test - 60

Result

Redox Reactions Test - 60

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Question 1

$$ 0,+1 $$ and -2

$$ +2,+1 $$ and -2

$$ 0,+1 $$ and +2

$$ -2,+1 $$ and -2

Solution

Question 2

$$ +3 $$

$$ +6 $$

$$ 0 $$

$$ -3 $$

Solution

Question 3

Hydrogen has the same ionization potential as alkali metals

$$H^-$$ has more electronegativity as halogens

$$H^-$$ has oxidation number of $$-1$$

$$H^-$$ will Dot be liberated at the anode.

Solution

Question 4

0

2

3

5

Solution

Question 5

$$1.2$$

$$1.6$$

$$1.8$$

$$1.5$$

Solution

Question 6

$$+6, 49.4$$

$$+4, 39.4$$

$$0, 39.4$$

$$+4, 59.4$$

Solution

Question 7

A - 3, B - 5, C - 4, D - 2

A - 3, B - 5, C - 4, D - 1

A - 6, B - 5, C - 4, D - 2

A - 6, B - 4, C - 5, D - 1

Solution

Question 8

$$ {Mg} + {N}_{2} \rightarrow {Mg}_{3}{N}_{2} $$

$$ {MnO}^{-}_{4} + {C}_{2}{O}^{2-}_{4} \rightarrow {Mn}^{2+} + {CO}_{2} $$

$$ CuS{O}_{4} + KI \rightarrow 2CuI + {I}_{2} + {K}_{2}S{O}_{4} $$

$$ AgCl + {NH}_{3} \rightarrow [Ag({NH}_{3})_{2}]Cl $$

Solution

Question 9

II, III in haematite and III in magnetite

II, III in haematite and II in magnetite

II in haematite and II, III in magnetite

III in haematite and II, III in magnetite

Solution

Question 10

$$NH_{3}$$, $$NO_{2}$$

$$NH_3$$, $$N_{2}O_{5}$$

$$N_{2}$$, $$HNO_{3}$$

$$N_{2}O$$, $$N_{2}O_{5}$$

Solution

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