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Hydrides of Nitrogen

Which one of ...

Question

Which one of the following is the strongest base?

A s H_{3}

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S b H_{3}

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P H_{3}

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N H_{3}

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Solution

The correct option is D $N H_{3}$
Among the hydrides of group 15, ammonia $N H_{3}$ is strongest base.

Due to smaller atomic size the lone pair electrons on $N$ in $N H_{3}$ is concentrated over a small region. Hence, it is more available for donation.

On moving down the group, with increase in atomic size, the lone pair is diffused over larger volume and is less available for donation. So, $N H_{3}$ is a stronger Lewis base and basic character decreases down the group.

Option (D) is correct.

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Similar questions

1. S b H_{3} > N H_{3} > A s H_{3} > P H_{3}

2. N H_{3} > P H_{3} > A s H_{3} > S b H_{3}

3. N H_{3} > P H_{3} > A s H_{3} > S b H_{3}

4. N H_{3} > P H_{3} > A s H_{3} > S b H_{3}

{N H}_{3}, {P H}_{3}, A s H_{3}

S b H_{3}

1. S b H_{3} > N H_{3} > A s H_{3} > P H_{3}

2. N H_{3} > P H_{3} > A s H_{3} > S b H_{3}

3. N H_{3} > P H_{3} > A s H_{3} > S b H_{3}

4. N H_{3} > P H_{3} > A s H_{3} > S b H_{3}

S i F_{4} < S i C l_{4} < S i B r_{4} < S i I_{4}

N H_{3} > S b H_{3} > A s H_{3} > P H_{3}

N H_{3} > S b H_{3} > A s H_{3} > P H_{3}

N H_{3} > S b H_{3} > A s H_{3} > P H_{3}

N H_{3}, P H_{3}, A s H_{3}, S b H_{3}

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