QBManager

Redox Reactions

18693 Which of these substances is a good reducing agent

1

N a O C l

2

H I

3

F e C l_{3}

4

K B r

Explanation:

(b) $H I$ (Hydrogen Iodide) is a good reducing agent than other compound.

Redox Reactions

19227 Assign $A, B, C, D$ from given type of reaction.

$3 K C N + F e (C N)_{3} ↓⟶ K_{3} [F e (C N)_{6}]$

1 for coloured ppt./Black ppt.

2 for coloured solution.

3 for clear/colourless solution

4 for white ppt.

Redox Reactions

18643 $H_{2} O_{2}$ reduces $M n {O_{4}}^{-}$ ion to

1

M n^{+}

2

M n^{2 +}

3

M n^{3 +}

4

M n^{-}

Explanation:

(b) $2 M n O_{4}^{Θ} + 5 H_{2} O_{2} + 6 H^{+}$ $\to M n^{2 +} + 5 O_{2} + 8 H_{2} O$ .

Redox Reactions

18644 When a sulphur atom becomes a sulphide ion

1 There is no change in the composition of atom

2 It gains two electrons

3 The mass number changes

4 None of these

Explanation:

(b) $S + 2 e^{-} \to S^{2 -}$

Redox Reactions

18693 Which of these substances is a good reducing agent

1

N a O C l

2

H I

3

F e C l_{3}

4

K B r

Explanation:

(b) $H I$ (Hydrogen Iodide) is a good reducing agent than other compound.

Redox Reactions

19227 Assign $A, B, C, D$ from given type of reaction.

$3 K C N + F e (C N)_{3} ↓⟶ K_{3} [F e (C N)_{6}]$

1 for coloured ppt./Black ppt.

2 for coloured solution.

3 for clear/colourless solution

4 for white ppt.

Redox Reactions

18643 $H_{2} O_{2}$ reduces $M n {O_{4}}^{-}$ ion to

1

M n^{+}

2

M n^{2 +}

3

M n^{3 +}

4

M n^{-}

Explanation:

(b) $2 M n O_{4}^{Θ} + 5 H_{2} O_{2} + 6 H^{+}$ $\to M n^{2 +} + 5 O_{2} + 8 H_{2} O$ .

Redox Reactions

18644 When a sulphur atom becomes a sulphide ion

1 There is no change in the composition of atom

2 It gains two electrons

3 The mass number changes

4 None of these

Explanation:

(b) $S + 2 e^{-} \to S^{2 -}$

Redox Reactions

18693 Which of these substances is a good reducing agent

1

N a O C l

2

H I

3

F e C l_{3}

4

K B r

Explanation:

(b) $H I$ (Hydrogen Iodide) is a good reducing agent than other compound.

Redox Reactions

19227 Assign $A, B, C, D$ from given type of reaction.

$3 K C N + F e (C N)_{3} ↓⟶ K_{3} [F e (C N)_{6}]$

1 for coloured ppt./Black ppt.

2 for coloured solution.

3 for clear/colourless solution

4 for white ppt.

Redox Reactions

18643 $H_{2} O_{2}$ reduces $M n {O_{4}}^{-}$ ion to

1

M n^{+}

2

M n^{2 +}

3

M n^{3 +}

4

M n^{-}

Explanation:

(b) $2 M n O_{4}^{Θ} + 5 H_{2} O_{2} + 6 H^{+}$ $\to M n^{2 +} + 5 O_{2} + 8 H_{2} O$ .

Redox Reactions

18644 When a sulphur atom becomes a sulphide ion

1 There is no change in the composition of atom

2 It gains two electrons

3 The mass number changes

4 None of these

Explanation:

(b) $S + 2 e^{-} \to S^{2 -}$

Redox Reactions

18693 Which of these substances is a good reducing agent

1

N a O C l

2

H I

3

F e C l_{3}

4

K B r

Explanation:

(b) $H I$ (Hydrogen Iodide) is a good reducing agent than other compound.

Redox Reactions

19227 Assign $A, B, C, D$ from given type of reaction.

$3 K C N + F e (C N)_{3} ↓⟶ K_{3} [F e (C N)_{6}]$

1 for coloured ppt./Black ppt.

2 for coloured solution.

3 for clear/colourless solution

4 for white ppt.

Redox Reactions

18643 $H_{2} O_{2}$ reduces $M n {O_{4}}^{-}$ ion to

1

M n^{+}

2

M n^{2 +}

3

M n^{3 +}

4

M n^{-}

Explanation:

(b) $2 M n O_{4}^{Θ} + 5 H_{2} O_{2} + 6 H^{+}$ $\to M n^{2 +} + 5 O_{2} + 8 H_{2} O$ .

Redox Reactions

18644 When a sulphur atom becomes a sulphide ion

1 There is no change in the composition of atom

2 It gains two electrons

3 The mass number changes

4 None of these

Explanation:

(b) $S + 2 e^{-} \to S^{2 -}$