JEE Mains · Chemistry · STD 12 - p -Block elements - ll
Choose the correct statements about the hydrides of group \(15\) elements. \(A\). The stability of the hydrides decreases in the order \(\mathrm{NH}_3>\mathrm{PH}_3>\mathrm{AsH}_3>\mathrm{SbH}_3>\mathrm{BiH}_3\) \(B\). The reducing ability of the hydrides increases in the order \(\mathrm{NH}_3<\mathrm{PH}_3<\mathrm{AsH}_3<\mathrm{SbH}_3<\mathrm{BiH}_3\) \(C\). Among the hydrides, \(\mathrm{NH}_3\) is strong reducing agent while \(\mathrm{BiH}_3\) is mild reducing agent. \(D\). The basicity of the hydrides increases in the order \(\mathrm{NH}_3<\mathrm{PH}_3<\mathrm{AsH}_3<\mathrm{SbH}_3<\mathrm{BiH}_3\)
Choose the most appropriate from the option given below.
- A \(B\) and \(C\) only
- B \(C\) and \(D\) only
- C \(A\) and \(B\) only
- D \(A \)and \(D\) only
Answer & Solution
Correct Answer
(C) \(A\) and \(B\) only
Step-by-step Solution
Detailed explanation
On moving down the group, bond strength of \(\mathrm{M}-\mathrm{H}\) bond decreases, which reduces the thermal stability but increases reducing nature of hydrides, hence \(A\) and \(B\) are correct statements.
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