Question

Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list:

List -I	List - II
Substances	Composition
(A) Plaster of paris	(i) $CaS{O}_4\cdot 2H_{2}O$
(B) Epsomite	(ii) $CaS{O}_4\cdot \frac{1}{2}{H}_{2}O$
(C) Kieserite	(iii) $MgS{O}_4\cdot 7H_{2}O$
(D) Gypsum	(iv) $MgS{O}_4\cdot H_{2}O$
	(v) $CaS{O}_4$

• A. $\left(A\right)-\left(iii\right),\left(B\right)-\left(iv\right),\left(C\right)-\left(i\right),\left(D\right)-\left(ii\right)$
• B. $\left(A\right)-\left(iv\right),\left(B\right)-\left(iii\right),\left(C\right)-\left(ii\right),\left(D\right)-\left(i\right)$
• C. $\left(A\right)-\left(ii\right),\left(B\right)-\left(iii\right),\left(C\right)-\left(iv\right),\left(D\right)-\left(i\right)$
• D. $\left(A\right)-\left(i\right),\left(B\right)-\left(ii\right),\left(C\right)-\left(iii\right),\left(D\right)-\left(v\right)$

Answer 1

The correct option is C $\left(A\right)-\left(ii\right),\left(B\right)-\left(iii\right),\left(C\right)-\left(iv\right),\left(D\right)-\left(i\right)$

(A) Plaster of paris is calcium sulphate hemihydrate $CaS{O}_4\cdot \frac{1}{2}{H}_{2}O$. It is a white powder.

(B) Epsomite is magnesium sulphate heptahydrate $MgS{O}_4\cdot 7H_{2}O$. It is also written as $\left[Mg\right(H_{2}O{)}_6]S{O}_4.H_{2}O$. It is also called epsom salt.

(C) Kieserite is magnesium sulphate monohydrate $MgS{O}_4\cdot H_{2}O$

(D) Gypsum is calcium sulphate dihydrate, $CaS{O}_4\cdot 2H_{2}O$. It exists in monoclinic and orthorhombic form.