$C a C l_{2} + H_{2} S O_{4} \to_{(H C l)}^{(p)} C a S O_{4} . 2 H_{2} O \overset{(q)}{\to} (r) \overset{> 393 K}{\to} (s)$
Which of the following option describes, the products, reactants and the reaction conditions.

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(p)	(q)	(r)	(s)
Crystallisation	Heat at 393 K	$2 C a S O_{4} . H_{2} O$	$C a S O_{4}$

(p)	(q)	(r)	(s)
Crystallisation	Heat at 393 K at high pressure	$2 C a S O_{4} . H_{2} O$	$C a S O_{4}$

(p)	(q)	(r)	(s)
Higher temperature	Cool	$C a S O_{4} . H_{2} O$	$C a S O_{4}$

(p)	(q)	(r)	(s)
Higher pressure	Heat at 393 K	$C a S O_{4}$	$C a S O_{3}$

answer is A.

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Detailed Solution

${CaCl}_{2} + H_{2} {SO}_{4} \to_{- HCl}^{Crystallisation} {CaSO}_{4} . 2 H_{2} O \overset{393 K}{\to} 2 {CaSO}_{4} . H_{2} O \overset{> 393 K}{\to} {CaSO}_{4}$

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