Redox Reactions Test

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Redox Reactions Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The characteristic oxidation number of atoms in free metals is:

A
$$-1$$

B
$$+1$$

C
any number

D
0

Solution

By convention, the oxidation number of free metals is zero.
Question 2
1 / -0

What is the oxidation number of lithium in $$LiCl$$?

A
$$+3$$

B
$$-1$$

C
$$+1$$

D
$$0$$

Solution

Oxidation number of $$Li$$ in $$LiCl:x-1=0$$
$$\Rightarrow x=+1$$
Question 3
1 / -0

What is the oxidation number of $$O$$ in a diatomic molecule $$({O}_{2})$$?

A
$$+2$$

B
$$\pm 2$$

C
$$+8$$

D
$$0$$

Solution

The oxidation state of any element in its native state is zero.

Hence, option D is correct.
Question 4
1 / -0

Oxidation state of iodine in $$I Cl_{2}^{-}$$ is :

A
+ 1

B
- 1

C
+ 2

D
- 2

Solution

Cl is in -1 oxidation state since it has lower atomic number than iodine. Let the oxidation state of iodine be x.
$$x+(-1)\times 2=-1$$
$$\therefore x=+1$$
Question 5
1 / -0

How many moles of electrons are involved in the reduction of one mole of $$MnO^-_4$$ ion in alkaline medium to $$MnO^-_3$$?

A
$$2$$

B
$$1$$

C
$$3$$

D
$$4$$

Solution

Reaction takes place as follows:
$$Mn{ O }_{ 4 }^{ - }+{ H }_{ 2 }O+{ 2e }^{ - }\rightarrow Mn{ O }_{ 3 }^{ - }+2O{ H }^{ - }$$
So, 2 electrons are involved in reduction of 1 mole of $${MnO}_4^{-}$$ ion in alkaline medium to $${MnO}_3^{-}$$.
Question 6
1 / -0

A redox reaction is one in which:

A
both the substance are reduced.

B
both the substance are oxidised.

C
one substance is reduced and other is oxidised.

D
all of the above.

Solution

In a redox reaction both oxidation and reduction is happening together.

Hence, the correct option is $$C$$.
Question 7
1 / -0

Oxidation number of chlorine in $$O_{3}$$ is ?

A
zero

B
+4

C
+2

D
-6

Solution

$$O_3$$ $$\text{Ozone is a molecule only consist of three oxygen atom.}$$
Question 8
1 / -0

Oxygen exhibits 0 oxidation state in:

A
CO

B
$$O_{2}$$

C
NO

D
$$N_{2}0$$

Solution

CO $$\rightarrow$$ The O.S of oxygen $$\rightarrow$$ -2
O$$_2$$ $$\rightarrow$$ of oxygen $$\rightarrow$$ 0
NO $$\rightarrow$$ The O.S of oxygen $$\rightarrow$$ -2
N$$_2$$O$$\rightarrow$$ The O.S of oxygen $$\rightarrow$$ -2.
Question 9
1 / -0

The oxidation state of the underlined element in the given compound is:
$$\underline{Ba}Cl_2$$

A
+2

B
-2

C
0

D
none of these

Solution

$$BaCl_2$$
$$\Rightarrow x+(-2)=0$$
$$\Rightarrow x=2$$
As chlorine needs only one electron to get octet.
Question 10
1 / -0

The oxidation state of the underlined element in the given compound is:
$$\underline{I}F_7$$

A
+5

B
+7

C
+6

D
none of these

Solution

$$IF_7$$
Fluorine is the most electronegative element and it has $$-1$$ .
$$\Rightarrow x-7 \times 1=0$$
$$\Rightarrow x=7$$ .

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Re-Attempt Weekly Quiz Competition

Redox Reactions Test - 13

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Redox Reactions Test - 13

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SHARING IS CARING

Question 1

$$-1$$

$$+1$$

any number

0

Solution

Question 2

$$+3$$

$$-1$$

$$+1$$

$$0$$

Solution

Question 3

$$+2$$

$$\pm 2$$

$$+8$$

$$0$$

Solution

Question 4

+ 1

- 1

+ 2

- 2

Solution

Question 5

$$2$$

$$1$$

$$3$$

$$4$$

Solution

Question 6

both the substance are reduced.

both the substance are oxidised.

one substance is reduced and other is oxidised.

all of the above.

Solution

Question 7

zero

+4

+2

-6

Solution

Question 8

CO

$$O_{2}$$

NO

$$N_{2}0$$

Solution

Question 9

+2

-2

0

none of these

Solution

Question 10

+5

+7

+6

none of these

Solution

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