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The gas evolved on heating alkali formate with soda-lime is
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Hydrogen
Alkali formate i.e. HCOONa with soda-lime i.e. $\mathrm{NaOH}+\mathrm{CaO}$ will react to give $\mathrm{Na}_{2} \mathrm{CO}_{3}$ and hydrogen gas is liberated.
$\mathrm{HCOONa}+\mathrm{NaOH} \stackrel{\mathrm{CaO}}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \uparrow$
$\mathrm{HCOONa}+\mathrm{NaOH} \stackrel{\mathrm{CaO}}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \uparrow$
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