Please help me experts

Dear Student

(a) 

When carbon is burnt in air, carbon dioxide is evolved along with a large amount of heat and light energy.

The chemical equation of the above reaction is as follows:

      C + O₂ → CO₂ + Heat + Light

(b)

$$\begin{gathered} When Calcium Carbonate is strongly heated, it undergoes thermal decomposition to form Carbon Dioxide and Calcium Oxide. \\ \mathit{R}\mathit{e}\mathit{a}\mathit{c}\mathit{t}\mathit{i}\mathit{o}\mathit{n}\mathbf{:} \\ CaC{O}_3 \stackrel{△}{\to } CaO + C{O}_2 \end{gathered}$$

(i) Sodium metal is very reactive. When dropped in water, it reacts vigorously to form sodium hydroxide and hydrogen gas is evolved. Hydrogen gas catches fire immediately after evolution.

Reaction occurring is:
2Na (s) + 2H₂O (l) ------------> 2NaOH (aq) + H₂ (g)

Sodium metal is so reactive that it can react with water vapours present in air. That is why, sodium is kept under kerosene or paraffin to avoid its contact with water vapours.

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