Among H2O,H2S,H2Se and H2Te, the one with the highest boiling point is:
A
H2O because of H− bonding
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B
H2Te because of higher molecular weight
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C
H2S because of H - bonding
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D
H2Se because of lower molecular weight
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Solution
The correct option is AH2O because of H− bonding Boiling point decreases down the group as the molar mass of the compounds increases.
But the order of boiling point is H2S<H2Se<H2Te<H2O due to hydrogen bonding in water. So, water will have the stronger intermolecular force and hence, more temperature will be required to boil it.