1.

In which of the following arrangements, the given sequence is not strictly according to the property indicated against it ?

Answer»

`HF lt HCl lt HBr lt HI` : increasing acid strength
`H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te` : increasing `pK_(a)` values
`NH_(3) lt PH_(3) lt AsH_(3) lt SbH_(3)` : increasing ACIDIC character
`CO_(2) lt SiO_(2) lt SnO_(2) lt PbO_(2)` : increasing oxidising POWER

SOLUTION :Increasing `pK_(a)` values means decreasing acidity but the given sequence represents increasing acidity. Thus, option (b) is incorrect.


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