On adding dilute $H C l$ to chalk piece, ${C O}_{2}$ is evolved. This is an example of:

a hetrogeneous reaction

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an acid-base reaction

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an oxidation-reduction reaction

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catalysed reaction

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Solution

The correct option is A a hetrogeneous reaction
Heterogeneous reactions are chemical reactions in which the reactants and products are in a different phase.
Dilute $H C l$ is a liquid, chalk piece is solid. Both react with each other to form $C O_{2}$ gas. So this reaction is a heterogeneous reaction.

$2 H C l (l) + C a C O_{3} (s) \to C a O C l_{2} (s) + C O_{2} (g)$

Hence, option $A$ is correct.

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Conversion of $C a C O_{3}$ into $C a O$ as per the reaction, $C a C O_{3} \to C a O + C O_{2}$ is an example of:

H C l

3 C l O_{(a q)}^{-} \to C l O_{3}^{-} + 2 C l^{-}

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