When hard water is passed through permutit, which ions are exchanged with `Ca^(2+) and Mg^(2+)` ?

Options

A. `Na^(+)`
B. `Al^(3+)`
C. `H^(+)`
D. All of these

Answer

A

Explanation

The sodium ions of permutit are exchanged with calcium and magnesium ions when hard water is passed through it.
`Na_(2)Al_(2)Si_(2)O_(8).xH_(2)O+Ca^(2+)orMg^(2+)to2Na^(+)+CaAl_(2)Si_(2)O_(8).xH_(2)O or MgAl_(2)Si_(2)O_(8).xH_(2)O`