JEE Main 2024 — Chemistry Inorganic Chemistry

2024mcqeasy

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:

Official previous-year question

Held on 30 Jan 2024 · Verified 6 Jul 2026.

Options

A
B and C only
B
C and D only
C
A and B only
D
A and D only

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Solution

On moving down the group from $N\mathrm{to}\mathrm{Bi}$ , the atomic size increases. Consequently, the electron density on the central atom decreases and the basic strength decreases.

With an increase in size, the $M-H$ bond becomes weaker, hence, the thermal stability decreases down the group.

The highest bond length will have less bond energy, indicating that it is a strong reducing agent.

On moving down the group, bond strength of M–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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Solution

On moving down the group from $N\mathrm{to}\mathrm{Bi}$ , the atomic size increases. Consequently, the electron density on the central atom decreases and the basic strength decreases.

With an increase in size, the $M-H$ bond becomes weaker, hence, the thermal stability decreases down the group.

The highest bond length will have less bond energy, indicating that it is a strong reducing agent.

On moving down the group, bond strength of M–H bond decreases, which reduces the thermal stability but increases reducing nature of hydrides,

Hence $A$ and $B$ are correct statements.

JEE Main 2024 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

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Physical Chemistry

Organic Chemistry

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JEE Main 2024 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry