Question

What are $X. Y$ and $Z$ in the following reactions?
$CaCO _{3} \ce{->[{\Delta}]} CO _{2}+X$
$X+ H _{2} O \longrightarrow Y$
$Y+ Cl _{2} \longrightarrow Z$

	X	Y	Z
(a)	$CaO$	$Ca ( OH )_{2}$	$CaOCl _{2} \cdot H _{2} O$
(b)	$CaO$	$Ca ( OCl )_{2}$	$Ca ( OH )_{2}$
(c)	$Ca ( OCl )_{2}$	$Ca ( OH )_{2}$	$CaO$
(d)	$Ca ( OH )_{2}$	$CaO$	$Ca ( OCl )_{2}$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (A)

$CaCO _{3} \ce{->[{\Delta}]}CO _{2}+\frac{ CaO }{X}$

$\frac{ CaO }{ X }+ H _{2} O \longrightarrow \frac{ Ca ( OH )_{2}}{Y}$

$\frac{ Ca ( OH )_{2}}{y}+ Cl _{2} \longrightarrow \frac{ CaOCl _{2}}{ Z } \cdot H _{2} O$

Calcium carbonate is strongly heated until it undergoes thermal decomposition to form calcium

oxide and carbon dioxide. The calcium oxide is dissolved in water to form calcium hydroxide.