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Boiling points of three substances X,Y and Z are in the order T_X > T_Y > T_Z. Identify X,Y and Z

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X	Y	Z
HF	H₂O	NH₃

X	Y	Z
H₂O	HF	NH₃

X	Y	Z
NH₃	HF	H₂O

X	Y	Z
NH₃	H₂O	HF

answer is B.

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Detailed Solution

Boiling point H₂O > HF

More number of H - bonds in water than in HF in liquid state.

In vapour state HF is associated due to H - bond but no association in water vapour.

Boiling point HF > NH₃

Electronegativity of F > N and size of F < N, H - bond is stronger in HF than in NH₃.

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