Q18 / 125 · BITSAT 2015 · Chemistry

Which of the following is a strong base?

A
$\mathrm{PH}_{3}$
B
$\mathrm{AsH}_{3}$
Correct answer
C
$\mathrm{NH}_{3}$
D
$\mathrm{SbH}_{3}$

Solution

Order of basic character is $\mathrm{NH}_{3}>\mathrm{PH}_{3}>$ $\mathrm{AsH}_{3}>\mathrm{SbH}_{3} .$ Basic-character decreases down the group from $\mathrm{N}$ to Bi due to increase in atomic size.

Hence, the correct answer is option: 'C'.

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