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JEE Advanced levelSingle correct optionDifficulty 3 of 3pn127

Assertion (A): The boiling point of is higher than that of . Reason (R): The molar mass of is greater than that of . Choose the correct option.

  1. ABoth A and R are true and R is the correct explanation of A.
  2. BBoth A and R are true but R is not the correct explanation of A.
  3. CA is true but R is false.
  4. DA is false but R is true.

Answer: C

NH3 (17 g/mol) boils higher than PH3 (34 g/mol) because of hydrogen bonding between NH3 molecules, so A is true. R is false because the molar mass of NH3 is smaller than that of PH3.
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