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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry1 Mark
MCQ
On adding dilute $\text{HCl}$ to chalk piece$, \mathrm{CO}_2$ is evolved. This is an example of:
  • ✓
    A hetrogeneous reaction.
  • B
    An acid-base reaction.
  • C
    An oxidation$-$reduction reaction.
  • D
    Catalysed reaction.
✓

Answer

Correct option: A.
A hetrogeneous reaction.
Heterogeneous reactions are chemical reactions in which the reactants and products are in a different phase.
Dilute $\text{HCl}$ is a liquid, chalk piece is solid. Both react with each other to form $\mathrm{CO}_2$ gas. So this reaction is a heterogeneous reaction.
$2 \mathrm{HCl}(\mathrm{l})+\mathrm{CaCO}_3(\mathrm{s}) \rightarrow \mathrm{CaOCl}_2(\mathrm{s})+\mathrm{CO}_2(\mathrm{g})$

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