One litre of water contains `10^(-7)` mole `H^(+)` ions. Degree of ionisation of water is:

Options

A. `1.8 xx 10^(-7)`
B. `1.8 xx 10^(-9)`
C. `3.6 xx 10^(-7)`
D. `3.6 xx 10^(-9)`

Answer

A

Explanation

`alpha% = ("No. of ionised ions " xx 100)/("Total no.of molecules")`
`= (18 xx 10^(-7) xx 6.023 xx 10^(23) xx 100)/(1000 xx 6.023 xx 10^(23))`
`= 1.8 xx 10^(-7)`