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Q.

Among the following, which has the highest boiling point ?

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a

NH3

b

PH3

c

AsH3

d

CH4

answer is A.

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Detailed Solution

  •  Boiling point of a compound is determined by its mass. 
  •  Mass of the molecule increases as we go down the group, boiling point is also increases. But NH3has high B.P due to presence of hydrogen bonding in  NH3.Thus, the boiling point of NH3 is higher than PH3 and AsH3 and CH4
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Among the following, which has the highest boiling point ?