JIPMER 2018

Exam: JIPMER
Year: 2018
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JIPMER 2018 · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following pair behaves as strong and weak base hydride...

Which of the following pair behaves as strong and weak base hydride repectively

\mathrm{NH}_3, \mathrm{PH}_3, \mathrm{AsH}_3, \mathrm{SbH}_3, \mathrm{BiH}_3

Options

A $\mathrm{NH}_3, \mathrm{PH}_3$
B $\mathrm{NH}_3, \mathrm{BiH}_3$
C $\mathrm{PH}_3, \mathrm{BiH}_3$
D $\mathrm{BiH}_3, \mathrm{AsH}_3$

Correct answer

B. $\mathrm{NH}_3, \mathrm{BiH}_3$

Step-by-step solution

The basic strength of given hydrides decreases in the order as follows

\mathrm{NH}_3\gt\mathrm{PH}_3\gt\mathrm{AsH}_3\gt\mathrm{SbH}_3\gt\mathrm{BiH}_3

This is due to the decrease in the availability of the lone pair of electrons which depends on the size of central atom that increase from N to Bi. Therefore,

\mathrm{NH}_3

and

\mathrm{BiH}_3

acts as a strong and weak base hydride respectively.

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