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JIPMER2018ChemistryClassification of Elements and Periodicity in Properties

Which of the following pair behaves as strong and weak base hydride repectively NH ₃, PH ₃, AsH ₃, SbH ₃, BiH ₃

Options

  1. ANH ₃, PH ₃
  2. BNH ₃, BiH ₃
  3. CPH ₃, BiH ₃
  4. DBiH ₃, AsH ₃

Correct answer

B. NH ₃, BiH ₃

Step-by-step solution

The basic strength of given hydrides decreases in the order as follows NH ₃ PH ₃ AsH ₃ SbH ₃ BiH ₃ This is due to the decrease in the availability of the lone pair of electrons which depends on the size of central atom that increase from N to Bi. Therefore, NH ₃ and BiH ₃ acts as a strong and weak base hydride respectively.

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