QBManager

Redox Reactions

18645 The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are

1

H_{2} O

alone

2

C O_{2}

alone

3

H_{2} O

and

C O_{2}

4 None of these

Explanation:

Food stuffs $+ O_{2} \to C O_{2} + H_{2} O$
$(C$ and $H)$

Redox Reactions

18646 When $P$ reacts with caustic soda, the products are $P H_{3}$ and $N a H_{2} P O_{2} .$ This reaction is an example of

1 Oxidation

2 Reduction

3 Oxidation and reduction (Redox)

4 Neutralization

Explanation:

(c) It shows oxidation and reduction (Redox) properties.

$\overset{0}{P_{4}} + 3 N a O H + 3 H_{2} O \to \underset{\begin{matrix} Sodium \\ hypophosphite \end{matrix}}{3 N a H_{2} P O_{2}} + \overset{- 3}{P H_{3}}$

Redox Reactions

18647 Which one of the following does not get oxidised by bromine water

1

F e^{+ 2}

to

F e^{+ 3}

2

C u^{+}

to

C u^{+ 2}

3

M n^{+ 2}

to

M n O_{4}^{-}

4

S n^{+ 2}

to

S n^{+ 4}

Explanation:

$M n^{2 +}$ to $M n O_{4}^{-}$ , come first in the series i.e $M n .$
We know that upper element reduce the lower one and oxidises the upper one.

Redox Reactions

18648 In the reaction $H_{2} S + N O_{2} \to H_{2} O + N O + S$ , $H_{2} S$ is

1 Oxidised

2 Reduced

3 Precipitated

4 None of these

Explanation:

(a) In this reaction $H_{2} S$ is oxidised because the oxidation state of ‘ $S$ ’ change from $- 2$ to $0$ .

Redox Reactions

18645 The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are

1

H_{2} O

alone

2

C O_{2}

alone

3

H_{2} O

and

C O_{2}

4 None of these

Explanation:

Food stuffs $+ O_{2} \to C O_{2} + H_{2} O$
$(C$ and $H)$

Redox Reactions

18646 When $P$ reacts with caustic soda, the products are $P H_{3}$ and $N a H_{2} P O_{2} .$ This reaction is an example of

1 Oxidation

2 Reduction

3 Oxidation and reduction (Redox)

4 Neutralization

Explanation:

(c) It shows oxidation and reduction (Redox) properties.

$\overset{0}{P_{4}} + 3 N a O H + 3 H_{2} O \to \underset{\begin{matrix} Sodium \\ hypophosphite \end{matrix}}{3 N a H_{2} P O_{2}} + \overset{- 3}{P H_{3}}$

Redox Reactions

18647 Which one of the following does not get oxidised by bromine water

1

F e^{+ 2}

to

F e^{+ 3}

2

C u^{+}

to

C u^{+ 2}

3

M n^{+ 2}

to

M n O_{4}^{-}

4

S n^{+ 2}

to

S n^{+ 4}

Explanation:

$M n^{2 +}$ to $M n O_{4}^{-}$ , come first in the series i.e $M n .$
We know that upper element reduce the lower one and oxidises the upper one.

Redox Reactions

18648 In the reaction $H_{2} S + N O_{2} \to H_{2} O + N O + S$ , $H_{2} S$ is

1 Oxidised

2 Reduced

3 Precipitated

4 None of these

Explanation:

(a) In this reaction $H_{2} S$ is oxidised because the oxidation state of ‘ $S$ ’ change from $- 2$ to $0$ .

Redox Reactions

18645 The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are

1

H_{2} O

alone

2

C O_{2}

alone

3

H_{2} O

and

C O_{2}

4 None of these

Explanation:

Food stuffs $+ O_{2} \to C O_{2} + H_{2} O$
$(C$ and $H)$

Redox Reactions

18646 When $P$ reacts with caustic soda, the products are $P H_{3}$ and $N a H_{2} P O_{2} .$ This reaction is an example of

1 Oxidation

2 Reduction

3 Oxidation and reduction (Redox)

4 Neutralization

Explanation:

(c) It shows oxidation and reduction (Redox) properties.

$\overset{0}{P_{4}} + 3 N a O H + 3 H_{2} O \to \underset{\begin{matrix} Sodium \\ hypophosphite \end{matrix}}{3 N a H_{2} P O_{2}} + \overset{- 3}{P H_{3}}$

Redox Reactions

18647 Which one of the following does not get oxidised by bromine water

1

F e^{+ 2}

to

F e^{+ 3}

2

C u^{+}

to

C u^{+ 2}

3

M n^{+ 2}

to

M n O_{4}^{-}

4

S n^{+ 2}

to

S n^{+ 4}

Explanation:

$M n^{2 +}$ to $M n O_{4}^{-}$ , come first in the series i.e $M n .$
We know that upper element reduce the lower one and oxidises the upper one.

Redox Reactions

18648 In the reaction $H_{2} S + N O_{2} \to H_{2} O + N O + S$ , $H_{2} S$ is

1 Oxidised

2 Reduced

3 Precipitated

4 None of these

Explanation:

(a) In this reaction $H_{2} S$ is oxidised because the oxidation state of ‘ $S$ ’ change from $- 2$ to $0$ .

Redox Reactions

18645 The ultimate products of oxidation of most of hydrogen and carbon in food stuffs are

1

H_{2} O

alone

2

C O_{2}

alone

3

H_{2} O

and

C O_{2}

4 None of these

Explanation:

Food stuffs $+ O_{2} \to C O_{2} + H_{2} O$
$(C$ and $H)$

Redox Reactions

18646 When $P$ reacts with caustic soda, the products are $P H_{3}$ and $N a H_{2} P O_{2} .$ This reaction is an example of

1 Oxidation

2 Reduction

3 Oxidation and reduction (Redox)

4 Neutralization

Explanation:

(c) It shows oxidation and reduction (Redox) properties.

$\overset{0}{P_{4}} + 3 N a O H + 3 H_{2} O \to \underset{\begin{matrix} Sodium \\ hypophosphite \end{matrix}}{3 N a H_{2} P O_{2}} + \overset{- 3}{P H_{3}}$

Redox Reactions

18647 Which one of the following does not get oxidised by bromine water

1

F e^{+ 2}

to

F e^{+ 3}

2

C u^{+}

to

C u^{+ 2}

3

M n^{+ 2}

to

M n O_{4}^{-}

4

S n^{+ 2}

to

S n^{+ 4}

Explanation:

$M n^{2 +}$ to $M n O_{4}^{-}$ , come first in the series i.e $M n .$
We know that upper element reduce the lower one and oxidises the upper one.

Redox Reactions

18648 In the reaction $H_{2} S + N O_{2} \to H_{2} O + N O + S$ , $H_{2} S$ is

1 Oxidised

2 Reduced

3 Precipitated

4 None of these

Explanation:

(a) In this reaction $H_{2} S$ is oxidised because the oxidation state of ‘ $S$ ’ change from $- 2$ to $0$ .

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