Which of the following is correct statement ?
(a) `AlCl_(3)` is conducting in fused state
(b) Mobility of `Li^(+)`ion in water is greater than `Cs^(+)`ion
( c) `MCl_(2)` is more volatile than ` MCl_(4)`
(d) `BeSO_(4)` is more soluble in water than `BaSO_(4)`

Options

A. a, b
B. b, c, d
C. b, d
D. Only d

Answer

D

Explanation

(a) `AlCl_(3)` is non conducting in fused state,
conducting only in aq. state.
(b) `Li^(+)(aq) gt Cs^(+)(aq)` - size
`Li^(+) (aq) lt Cs^(+) (aq)` - mobility
`:.` mobility `prop (1)/("size")`
(c ) Covalent character `(uarr) =` volatile properties `(uarr)`
`overset(+2)MCl_(2) lt overset(+4)MCl_(4)to` covalent character because size of M in `MCl_(4)` lesser than `MCl_(2)`
(d) `BeSO_(4) gt BaSO_(4)` - solubility