NCERT Exemplar XVIII — task. Science CBSE, Class 10.

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1. Complete the missing components/variables given as 'x' and 'y' in the following reactions.

$CaCO_3$ (s)

$\xrightarrow[]{x}$

$CaO$ (s) +

$CO_2$ (g)

In the above reaction,

$x$ is . When calcium carbonate is , it decomposes into calcium oxide (quick lime) and carbon dioxide.

$CaCO_3$ (s)

$\xrightarrow[]{Heat}$

$CaO$ (s) +

$CO_2$ (g)

2. Which among the following changes are exothermic or endothermic in nature?

Dissolution of ammonium chloride in water.

$NH_4Cl$ (s) +

$H_2O$ →

$NH_4{^+}$ (aq) +

$Cl^−$ (aq)

The dissolution of ammonium chloride in water is an reaction because it includes to generate ammonium

$NH_4{^+}$ ion and chlorine

$Cl^−$ ion.

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45. NCERT Exemplar XVIII