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KCET2023Chemistryp Block Elements (Group 15, 16, 17 & 18)

The correct decreasing order of basicity of hydrides of group- 15 elements is

Options

  1. ASbH ₃> AsH ₃> PH ₃> NH ₃
  2. BPH ₃> AsH ₃> SbH ₃> NH ₃
  3. CAsH ₃> SbH ₃> NH ₃> PH ₃
  4. DNH ₃> PH ₃> AsH ₃> SbH ₃

Correct answer

D. NH ₃> PH ₃> AsH ₃> SbH ₃

Step-by-step solution

In general, the basicity of group 15 hydrides decreases on moving down the group from NH ₃ to SbH ₃ . This is due to the increasing size of the central atom and the decreasing availability of lone pair for donation. Thus, the correct order of basicity of hydrides is NH ₃> PH ₃> AsH ₃> SbH ₃

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