Question

Among the hydrides of group $$16$$ elements, which has the lowest boiling point?

Answer 1

The boiling points of the hydrides of group 16 elements is as follows:

• $$H_2O$$ $$\rightarrow$$ $$100^{\circ}C$$
• $$H_2S$$ $$\rightarrow$$ $$- (60^{\circ }C)$$
• $$H_2Se$$ $$\rightarrow$$ $$-(41.25^{\circ}C)$$
• $$H_2Te$$ $$\rightarrow$$ $$-(2.2^{\circ}C)$$

• Gradual increase in boiling points down the rest of the group happens as the relative molecular mass of the molecules increases.
• Also, boiling point of water is $$\textbf{anomalously}$$ high.

Hence $$H_2S$$ has lowest boiling point here.