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

Options

A. `As_(2)O_(3) lt SiO_(2) lt P_(2)O_(3) lt SO_(2)` Acid strength.
B. `AsH_(3) lt PH_(3) lt NH_(3)` Enthalpy of vapourisation
C. `S lt O lt Cl lt F` More negative electron gain enthalpy.
D. `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te` Thermal stability.

Answer

A, D

Explanation

Acidic strength of oxides in group: Decreases down the group and increases along a period from left to right.
Thermal stability of hydrides of group 16 decreases down the group.