question_answer

From the data given below, which of the following is most effective drying agent at\[0{}^\circ C\].

I.	\[SrC{{l}_{2}}\cdot 6{{H}_{2}}O(s)\rightleftharpoons SrC{{l}_{2}}\cdot 2{{H}_{2}}O(s)+4{{H}_{2}}O(g)\]
		\[{{K}_{p}}={{10}^{-12}}at{{m}^{4}}\]
II.	\[N{{a}_{2}}HP{{O}_{4}}\cdot 12{{H}_{2}}O(s)\rightleftharpoons N{{a}_{2}}HP{{O}_{4}}\cdot 7{{H}_{2}}O(s)+5{{H}_{2}}O(g)\]
		\[{{K}_{p}}=5.25\times {{10}^{-13}}at{{m}^{5}}\]
III.	\[N{{a}_{2}}S{{O}_{4}}\cdot 10{{H}_{2}}O(s)\rightleftharpoons N{{a}_{2}}S{{O}_{4}}(s)+10{{H}_{2}}O(g)\]
		\[{{K}_{p}}=4.08\times {{10}^{-25}}at{{m}^{10}}\]

Given: The vapour pressure of water (i,e., \[P({{H}_{2}}O)at\,0{}^\circ C=6.0\times {{10}^{-3}}atm\]

A) \[SrC{{l}_{2}}.2{{H}_{2}}O\] 

B) \[N{{a}_{2}}HP{{O}_{4}}.7{{H}_{2}}O\]

C) \[N{{a}_{2}}S{{O}_{4}}\]              

D) All of these