A salt which gives $\mathrm{CO}_{2}$ with hot conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ and also decolourizes…

A salt which gives $\mathrm{CO}_{2}$ with hot conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ and also decolourizes acidified $\mathrm{KMnO}_{4}$ on warming is:
  1. $\mathrm{HCO}_{3}^{-}$
  2. $\mathrm{CO}_{3}^{2-}$
  3. Oxalate
  4. Acetate

Solution

$\mathrm{Na}_2 \mathrm{C}_2 \mathrm{O}_4+\mathrm{H}_2 \mathrm{SO}_4 ightarrow \mathrm{Na}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}+\mathrm{CO}_2$
$\text {CO burns with blue flame } 2 \mathrm{CO}+\mathrm{O}_2 ightarrow 2 \mathrm{CO}_2$
$\mathrm{Na}_2 \mathrm{C}_2 \mathrm{O}_4+\mathrm{H}_2 \mathrm{SO}_4(\mathrm{dil}) ightarrow \mathrm{Na}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$
$2 \mathrm{KMnO}_4+3 \mathrm{H}_2 \mathrm{SO}_4+5 \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 ightarrow \mathrm{K}_2 \mathrm{SO}_4+2 \mathrm{MnSO}_4+8 \mathrm{H}_2 \mathrm{O}+10 \mathrm{CO}_2$ *

Asked in: JEE-TOPICTESTS-CHEMISTRY

Practice more PRACTICAL CHEMISTRY questions on Aicharya