MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions

Which of the following pair behaves as strong and weak base hydride respectively? (JIPMER 2018)

A.NH₃, PH₃

B.NH₃, BiH₃✓ Correct

C.PH₃, BiH₃

D.BiH₃, AsH₃

Explanation

The basic strength of given hydrides decreases I the order as follows: NH₃ > PH₃ . AsH₃ > SbH₃ > BiH₃ 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, NH₃ and BiH₃ acts as a strong and weak base hydride respectively.

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