Which is the gas evolved when carboxylic acids react with strongly electropositive metals (such as Na, K, Ca, Zn)?
- ✓$\mathrm{H}_2$
- B$\mathrm{H}_2 \mathrm{O}$ vapour
- C$\mathrm{O}_2$
- D$\mathrm{CO}_2$
Answer: A.
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