JEE MAIN - Chemistry (2024 - 30th January Evening Shift - No. 11)
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 hydride 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 options given below :
C and D only
A and D only
A and B only
B and C only
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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