The sBlock Elements - Result Question 40
####46. Match List - I with List-II for the compositions of substances and select the correct answer using the code given below the lists :
[2011M] List - I
Substances
(1) Plaster of paris
(2) Epsomite
(3) Kieserite
(4) Gypsum
List - II Composition
(i) $CaSO_4 \cdot 2 H_2 O$
(ii) $CaSO_4 \cdot \frac{1}{2} H_2 O$
(iii) $MaSO_4 \cdot 7 H_2 O$
(iv) $MgSO_4 \cdot H_2 O$
(v) $CaSO_4$ Code :
\begin{tabular}{|c|c|c|} \hline (1) & (2) & (3) \\ \hline (iii) & (iv) & (i) \\ \hline (ii) & (iii) & (iv) \\ \hline (i) & (ii) & (iii) \\ \hline (iv) & (iii) & (ii) \\ \hline \end{tabular}
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Solution:
- (b) (A) Plaster of paris $=CaSO_4 \cdot \frac{1}{2} H_2 O$
(B) Epsomite $=MgSO_4 \cdot 7 H_2 O$
(C) Kieserite $=MgSO_4 \cdot H_2 O$
(D) Gypsum $=CaSO_4 \cdot 2 H_2 O$
Plaster of paris can be more accurately written as $(CaSO_4)_2 \cdot H_2 O$
