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What happens when
(i) sodium metal is dropped in water ?
(ii) sodium metal is heated in free supply of air ?
(iii) sodium peroxide dissolves in water ?
(i) sodium metal is dropped in water ?
(ii) sodium metal is heated in free supply of air ?
(iii) sodium peroxide dissolves in water ?
Solution:
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Verified Answer
(i) \(\mathrm{H}_2\) gas is evolved which catches fire due to the exothermicity of the reaction.
\(2 \mathrm{Na}(\mathrm{s})+2 \mathrm{H}_2 \mathrm{O}(\ell) \longrightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2\) (g)
(ii) \(\mathrm{Na}_2 \mathrm{O}_2\) along with a small amount of \(\mathrm{Na}_2 \mathrm{O}\) is formed.
(iii) \(\mathrm{H}_2 \mathrm{O}_2\) is formed.
\(\mathrm{Na}_2 \mathrm{O}_2(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{O}(\ell) \longrightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}_2 \text { (I) }\)
\(2 \mathrm{Na}(\mathrm{s})+2 \mathrm{H}_2 \mathrm{O}(\ell) \longrightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2\) (g)
(ii) \(\mathrm{Na}_2 \mathrm{O}_2\) along with a small amount of \(\mathrm{Na}_2 \mathrm{O}\) is formed.
(iii) \(\mathrm{H}_2 \mathrm{O}_2\) is formed.
\(\mathrm{Na}_2 \mathrm{O}_2(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{O}(\ell) \longrightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}_2 \text { (I) }\)
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