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)	$CaSO_{4}.\frac{1}{2}H_{2}O$	(C)	antacid
(IV)	$CaCO_{3}$	(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

$2 NH _{3}+ H _{2} O + CO _{2} \to \left( NH _{4}\right)_{2} CO _{3} $

$( NH _{4})_{2} CO _{3}+ H _{2} O + CO _{2} \to 2 NH _{4} HCO _{3} $

$NH _{4} HCO _{3}+ NaCl \to NH _{4} Cl + NaHCO _{3}( s )$

$2 NaHCO _{3} \stackrel{\Delta}{\longrightarrow } Na _{2} CO _{3}+ CO _{2}+ H _{2} O$

(III) $CaSO _{4} \cdot \frac{1}{2} H _{2} O$ (Plaster of Paris) is used for making casts of statues

(IV) $CaCO _{3}$ is used as an antacid