1.

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 acidic 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 oxidizing power

Solution :If acidic nature is high, `K_(a)` is high and `pK_(a)` is low.
`H_(2)O t H_(2)S lt H_(2)Se lt H_(2)Te`:Acidic nature (Order of `K_(a)`)
`H_(2)O GT H_(2)S gt H_(2)Se gt H_(2)Te`:Order of `pK_(a)`


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