Q21 / 160 · AP EAMCET 2003 · Chemistry

A mixture of sodium oxide and calcium oxide are dissolved in water, and saturated with excess carbon dioxide gas. The resulting solution is ...... It contains ......... :

  • A
    basic; $\mathrm{NaOH}$ and $\mathrm{Ca}(\mathrm{OH})_2$
  • B
    neutral; $\mathrm{Na}_2 \mathrm{CO}_3$ and $\mathrm{CaCO}_3$
  • Correct answer
    C
    basic; $\mathrm{Na}_2 \mathrm{CO}_3$ and $\mathrm{CaCO}_3$
  • D
    acidic; $\mathrm{NaOH}$ and $\mathrm{CaCO}_3$

Solution

$\mathrm{Na}_2 \mathrm{O}+\mathrm{CaO}+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2 \longrightarrow$ $\mathrm{Na}_2 \mathrm{CO}_3+\mathrm{CaCO}_3$ Solution is basic. It can be proved as $\mathrm{CO}_3^{2-}+2 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{H}_2 \mathrm{CO}_3+2 \mathrm{OH}^{-}$

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

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