Question

Read following statement(s) carefully and select the right option :
(I) The enthalpy of solution of `CaCl_(2). 6H_(2)O` in a large volume of water is endothermic to the extent of 3.5 kcal/mol. If `DeltaH=-23.2 " kcal"` for the reaction,
`CaCl_(2)(s)+6H_(2)O(l)rarrCaCl_(2).6H_(2)O(s)`
then heat of solution of `CaCl_(2)` (anhydrous) in a large volume of water is - 19.7 kcal/mol
(II) For the reaction `2Cl(g)rarrCl_(2)(g)`, the sign of `DeltaH` and `DeltaS` are negative.
A. Statement I and II both are wrong
B. both are correct
C. only I is correct
D. only II is correct

Answer 1

Correct Answer - B
`CaCl_(2)(s)+aqrarrCaCl_(2)(aq)+q`
`(CaCl_(2)(aq)+6H_(2)O(l)rarrCaCl_(2).6H_(2)O(s)+23.2)/(CaCl_(2)(s)+6H_(2)OrarrCaCl_(2).6H_(2)O(s)+q+23.2)`
`3.5 = q + 23.2`
`q = - 19.7`
(II) 2 Cl (g) `rarrCl_(2)(g)`
`DeltaH=-ve, DeltaS=-ve`.