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KCET2021Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which of the following property is true for the given sequence? NH ₃> PH ₃> AsH ₃> SbH ₃> BiH ₃ ?

Options

  1. AReducing property
  2. BThermal stability
  3. CBond angle
  4. DAcidic character

Correct answer

B. Thermal stability

Step-by-step solution

Thermal stability of the hydrides of nitrogen family decreases down the group as NH ₃> PH ₃> AsH ₃> SbH ₃> BiH ₃ Because on moving down the group size increase (from N to Bi). As a result, bond strength decreases.

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