Duration: 5:47

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The decomposition of a certain mass of \( \mathrm{CaCO}_{3} \) gave \( 11.2 \) \( \mathrm{dm}^{3} \) of \( \mathrm{CO}_{2} \) gas at S.T.P. The mass of \( \mathrm{KOH} \) required to completely neutralize the gas is
(atomic wt. of \( K=39 \), \( \mathrm{Ca}=40 \) )
\[
\begin{array}{l}
\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2} \\
2 \mathrm{KOH}+\mathrm{CO}_{2} \rightarrow \mathrm{K}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}
\end{array}
\]
(A) \( 28 \mathrm{~g} \)
(B) \( 20 \mathrm{~g} \)
(C) \( 56 \mathrm{~g} \)
(D) \( 42 \mathrm{~g} \)
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