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Redox Reaction

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Question

Complete the following chemical reactions.
$P b S_{(s)} + H_{2} O_{2 (a q)} \to$

$M n O_{4 (a q)}^{-} + H_{2} O_{(g)} \to$

$C a O_{(s)} + H_{2} O_{(l)} \to$

$A l C l_{3 (g)} + H_{2} O_{(l)} \to$

$C a_{3} N_{2 (s)} + H_{2} O_{(l)} \to$
Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

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Solution

$P b S_{(s)} + 4 H_{2} O_{2 (a q)} \to P b S O_{4 (s)} + 4 H_{2} O_{(l)}$
$H_{2} O_{2}$ is acting as an oxidizing agent in the reaction. Hence, it is a redox reaction.

$4 M n O_{4 (a q)}^{-} + 6 H_{2} O_{(g)} \to 12 O H_{(a q)}^{-} + 4 M n_{(a q)}^{2 +} + 5 O_{2 (g)}$
$H_{2} O_{2 (g)}$ is acting as a reducing agent in the acidic medium, thereby oxidizing $M n O_{4 (a q)}^{-}$ .
Hence the given reaction is a redox reaction.

$C a O_{(s)} + H_{2} O_{(l)} \to C a (O H)_{2 (a q)}$
The reactions in which a compound reacts with water to produce other compounds are called hydrolysis reactions. The given reaction is hydrolysis.

$2 A l C l_{3 (g)} + 3 H_{2} O_{(l)} \to A l_{2} O_{3 (s)} + 6 H C l_{(a q)}$
The reactions in which a compound react with water to produce compounds are called hydrolysis reactions. The given reaction represents hydrolysis of $A l C l_{3}$ .

$C a_{3} N_{2 (s)} + 6 H_{2} O_{(l)} \to 3 C a (O H)_{2 (a q)} + 2 N H_{3 (g)}$
The reactions in which a compound reacts with water to produce other compounds are called hydrolysis reactions. The given reaction represents hydrolysis of $C a_{3} N_{2}$ .

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