MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic 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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