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  4. The decreasing order of the bond moment of E-H bond in NH3 , PH3 , AsH3 and SbH3 is given by

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Q. The decreasing order of the bond moment of E-H bond in NH3 , PH3 , AsH3 and SbH3 is given by

NTA AbhyasNTA Abhyas 2020Classification of Elements and Periodicity in Properties

Solution:

Electronegativities of N(3.0), P (2.1), As (2.0), Sb (1.9) and H (2.1) point out clearly that the correct order of decreasing polarity is :

NH3 > SbH3 > AsH3 > PH3