1.

Consider three compounds : H2S, H2Se and H2O. Identify which has the highest boiling point. Justify.

Answer»

Among the three compounds H2O, H2S and H2Se, the first one, H2O has the smallest molecular mass. But it has the highest B.P. of 100°C. B.P. of H2S is -60°C and of H2Se is -41.25°C. The extraordinary high B.P. of H2O is due to very strong hydrogen bonding even though it has the lowest molecular mass.



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