1.

The Incorrect order of property of the following is : (a) (Basic nature) Na_(2)O gt MgO gt Al_(2)O_(3)gt SiO_(2) (b) (2^(nd)I.P.)Na gt S gt P gt Si (c ) (Electron affinity) O gt S gt Se (d) (Size l^(-) lt l lt l^(+)

Answer»

a, C, d
B, c, d
c, d
a, b, c

Solution :`[H^(+)]_(HCl)=10^(-5)xx(1)/(1000)=10^(-8)`
`THEREFORE 10^(-7)M H^(+)` (of water) cannot be neglected
`[H^(+)]_("total")=10^(-8)+10^(-7)=1.1xx10^(-7)`
`pH=7-log 1.1 ~~ 6.98`


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