Q9 / 58 · KVPY 2016 (SA) · Chemistry

One mole of one of the sodium salts listed below, having carbon content close to $14.3 \%$ produces 1 mole of carbon dioxide upon heating (atomic mass $\mathrm{Na}=23, \mathrm{H}=1, \mathrm{C}=12, \mathrm{O}=16$ ). The salt is

  • A
    $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COONa}$
  • Correct answer
    B
    $\mathrm{NaHCO}_{3}$
  • C
    $\mathrm{HCOONa}$
  • D
    $\mathrm{CH}_{3} \mathrm{COONa}$

Solution

$2 \mathrm{NaHCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}$ $\%$ of $\mathrm{C}=\frac{12}{84} \times 100=14.28 \%$ This Question can be done by checking $\%$ of carbon $14.2 \%$ comes only in $\mathrm{NaHCO}_{3}$

Hence, the correct answer is option: 'B'.

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