Question

`S_(2) :` Plaster of paris is a hemihydrate of calcium sulphate obtained by heating the gypsum above `393K`.
`S_(2) :` Sodium carbonate is used in water softening.
`S_(4) :` The order of mobilities of the alkali metal ions in aqueous solutions is `Li^(+)gtNa^(+)gtK^(+)gtRb^(+)gtCs^(+)`
A. ` T T F`
B. `T T T `
C. `F T F`
D. `F F F`

Answer 1

Correct Answer - 3
`S_(1):(2CaSO_(4).2H_(2)O)overset(393K)rarr2(CaSO_(4)).H_(2)O+3H_(2)O,` above `393K` dead burnt plaster is obtained.
`S_(2):Ca^(2+)+Na_(2)CO_(3)rarrCaCO_(3)darr+2Na^(+)`
`S_(3):Li^(+) lt Na^(+) lt K^(+) lt Kb^(+) lt Cs^(+)`
Bigger hydrated ion moves slower in aqueous solution.