1.

Which of the following orders are correct as per the properties mentioned against each ?

Answer»

`SiO_(2) lt As_(2)O_(3) lt P_(2)O_(3) lt SO_(2)""` Acid strength
`AsH_(3) lt PH_(3) lt NH_(3)""` Enthalpy of vapourisation
`S lt O lt Cl lt F""` More negative electron gain enthalpy
`H_(2)O GT H_(2)S gt H_(2)Se gt H_(2)TE""` Thermal stability

Solution :Acid strength increases in the order : `SiO_(2) lt As_(2)O_(3) lt P_(2)O_(3) lt SO_(2)` and thermal stability decreases in the order : `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te.
Thus, optio (a) and (d) are CORRECT.


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