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Question

Which of the following exhibits highest solubility in H2O:

A
NH3
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B
PH3
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C
AsH3
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D
SbH3
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Solution

The correct option is A NH3
As the size of the nitrogen in ammonia(NH3) is small when compared to the central atoms of other hydrides of the 5th group, so it is most electro-negative atom and forms a strong hydrogen bonding with water molecules and dissolve more(solubility is high).
Hence option A is correct.

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