What is an oxidation reaction ? Identify in the following reactions :
(i) the substance oxidised (ii) the substance reduced.
$Z n O + C \to Z n + C O$

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Solution

Oxidation involves the addition of oxygen or the removal of hydrogen in a chemical reaction while reduction involves the addition of hydrogen or removal of oxygen.

In the given reaction:

(i) Carbon (C) is oxidised to carbon monoxide (CO).

(ii) Zinc oxide (ZnO) is reduced to zinc (Zn).

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Z n O + C \to Z n + C O

Identify the substance that is oxidised and the substances that are reduced in the following reactions:

$1 . {MnO}_{2} + 4 HCl \to {MnCl}_{2} + 2 H_{2} O + {Cl}_{2} 2.4 Na + O_{2} \to 2 {Na}_{2} O 3 . ZnO + C \to Zn + CO$

\begin{matrix} s . n o . & C h e m i c a l r e a c t i o n & S u b s t a n e o x i d i s e d & S u b s t a n c e r e d u c e d & O x i d i s i n g a g e n t & R e d u c i n g a g e n t 1. & 2 H_{2} S + S O_{2} \to 2 H_{2} O + 3 S 2. & Z n O + C \to Z n + C O \end{matrix}

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