Question

Match the following compounds (Column-I) with their uses (Column-II) :

S.No.	Column-I	S.No.	Column-II
(I)	$Ca(OH{)}_2$	(A)	casts of statue
(II)	$NaCl$	(B)	white wash
(III)	$CaS{O}_4.\frac{1}{2}{H}_{2}O$	(C)	antacid
(IV)	$CaC{O}_3$	(D)	washing soda preparation

• A. $(I)-(D),(II)-(A),(III)-(C),(IV)-(B)$
• B. $(I)-(B),(II)-(C),(III)-(D),(IV)-(A)$
• C. $(I)-(C),(II)-(D),(III)-(B),(IV)-(A)$
• D. $(I)-(B),(II)-(D),(III)-(A),(IV)-(C)$

Answer 1

Answer: (D)

(I) $Ca(OH{)}_2$ is used in white wash

(II) $NaCl$ is used in preparation of washing soda

$2N{H}_3+H_{2}O+C{O}_2\to {\left(N{H}_4\right)}_{2}C{O}_3$

$(N{H}_4{)}_{2}C{O}_3+H_{2}O+C{O}_2\to 2N{H}_{4}HC{O}_3$

$N{H}_{4}HC{O}_3+NaCl\to N{H}_{4}Cl+NaHC{O}_3(s)$

$2NaHC{O}_3\stackrel{\Delta }{⟶}N{a}_{2}C{O}_3+C{O}_2+H_{2}O$

(III) $CaS{O}_4\cdot \frac{1}{2}{H}_{2}O$ (Plaster of Paris) is used for making casts of statues

(IV) $CaC{O}_3$ is used as an antacid