Question

The gas evolved on heating alkali formate with soda-lime is

• A. CO
• B. CO\(_2\)
• C. Hydrogen
• D. water vapor

Hint:

Alkali formates on heating with soda lime produce hydrogen gas and carbonate salt.

Answer 1

The Correct Option is C

Step 1: Identify alkali formate.
Alkali formate is \(HCOONa\) or \(HCOOK\).
Step 2: Understand soda lime.
Soda lime is a mixture of NaOH and CaO.
It is generally used for decarboxylation.
Step 3: Reaction of alkali formate with NaOH (soda lime).
When heated, alkali formate decomposes giving hydrogen gas:
\[ HCOONa + NaOH \xrightarrow{\Delta} Na_2CO_3 + H_2 \]
Step 4: Conclusion.
Thus the gas evolved is hydrogen.
Final Answer:
\[ \boxed{\text{(C) Hydrogen}} \]