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Types of Redox Reactions

Which of the ...

Question

Which of the following reactions does not involve oxidation-reduction?

2 R b + 2 H_{2} O ⟶ 2 R b O H + H_{2}

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2 C u I_{2} ⟶ 2 C u I + I_{2}

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N H_{4} C l + N a O H ⟶ N a C l + N H_{3} + H_{2} O

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4 K C N + F e {(C N)}_{2} ⟶ K_{4} [F e {(C N)}_{6}]

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Solution

The correct options are
C $N H_{4} C l + N a O H ⟶ N a C l + N H_{3} + H_{2} O$
D $4 K C N + F e {(C N)}_{2} ⟶ K_{4} [F e {(C N)}_{6}]$
The reactions are as follows:
$2 R b + 2 H_{2} O ⟶ 2 R b O H + H_{2}$
0 +1 +2 0
$2 C u I_{2} ⟶ 2 C u I + I_{2}$
+2 +1 0
$N H_{4} C l + N a O H ⟶ N a C l + N H_{3} + H_{2} O$
$4 K C N + F e {(C N)}_{2} ⟶ K_{4} [F e {(C N)}_{6}]$
As we can see that in (C) and (D), the oxidation numbers of the various elements do not change.
Therefore, they are not redox reactions.

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Similar questions

2 C s + 2 H_{2} O ⟶ 2 C s O H + H_{2}

2 C u I_{2} ⟶ 2 C u I + I_{2}

N H_{4} B r + K O H ⟶ K B r + N H_{3} + H_{2} O

4 K C N + F e {(C N)}_{2} ⟶ K_{4} [F e {(C N)}_{6}]

A

N H_{4} C l

D

C O_{2}

B

C

+ N a O H \to N a C l + N H_{3} + H_{2} O

N H_{3} + C O_{2} + H_{2} O \to (B)

+ N a C l \to (C) + N H_{4} C l

\to N a_{2} C O_{3} + H_{2} O + (D)

N H_{3}

0.535 g

N H_{4} C l

N a O H

N H_{4} C l + N a O H \to N H_{3} + N a C l + H_{2} O

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