Iron (III) oxide on heating with carbon monoxide gas form solid iron and liberates carbon dioxide gas. This is a:

precipitation reaction

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double decomposition reaction

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synthesis reaction

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redox reaction

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Solution

The correct option is D redox reaction
Reaction of Iron(III) oxide ( $F e_{2} O_{3}$ ) with carbon monoxide ( $C O$ ) to form iron ( $F e$ ) and carbon dioxide ( $C O_{2}$ ), is a redox reaction as both oxidation of carbon monoxide and reduction of iron is taking place. The equation can be written as: $F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}$

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Question 33
Write a balanced chemical equation for each of the following reactions and also classify them.

(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

(I I I)

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