Question

Identify W, X, Y, and Z respectively in the given reactions.

$CaCO_{3}\overset{\quad\Delta\quad}{\rightarrow}W + X$

$W + H_{2}O \rightarrow Y$

$Y + Z \rightarrow NaOH + CaCO_{3}$

• A. CaO, $CO_{2},$ $CaCO_{3}$ $Na_{2}CO_{3}$
• B. $CO_{2,}$ $Ca(OH)_{2},$ $Ca(HCO)_{3},$ $NaHCO_{3}$
• C. CaO, $CO_{2},$ $Ca(OH)_{2},$ $Na_{2}CO_{3}$
• D. $CO_{2},$ CaO, $H_{2}CO_{3},$ $Na_{2}CO_{3}$

Answer 1

Answer: (C)

CaO, $CO_{2},$ $Ca(OH)_{2},$ $Na_{2}CO_{3}$

Answer 2

:

$\underset{(W)}{CaO} + H_{2}O \rightarrow \underset{(Y)}{Ca(OH)_{2}}$

$\underset{(Y)}{Ca(OH)_{2}} + \underset{(Z)}{Na_{2}CO_{3}} \rightarrow CaCO_{3} + 2NaOH$