KCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Which of the following property is true for the given sequence? \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}>\mathrm{BiH}_{3}\) ?
- A Reducing property
- B Thermal stability
- C Bond angle
- D Acidic character
Answer & Solution
Correct Answer
(B) Thermal stability
Step-by-step Solution
Detailed explanation
Thermal stability of the hydrides of nitrogen family decreases down the group as
\(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}>\mathrm{BiH}_{3}\)
Because on moving down the group size increase (from \(\mathrm{N}\) to Bi). As a result, bond strength decreases.
\(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}>\mathrm{BiH}_{3}\)
Because on moving down the group size increase (from \(\mathrm{N}\) to Bi). As a result, bond strength decreases.
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