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Question

Which of the following(s) is/are poisonous?

A
H2O
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B
H2S
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C
H2Se
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D
H2Te
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Solution

The correct option is D H2Te
The hydride of oxygen, i.e., H2O is a colourless, odourless liquid while the hydrides of all the other group 16 elements are unpleasant, foul smelling, poisonous gases. H2O has the highest boiling point of 373 K amongst the hydrides of group 16 elements.

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