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Q.

Element A has principal quantum number 2 for last electron and it has 3 electrons in valence shell and eletnent B has principal quantum number 3 for last electron and it has 7 electrons in valence shell. The bond angle in compound of A and B (containing single central atom) will be :

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a

90°

b

120°

c

60°

d

180°

answer is A.

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Detailed Solution

The B follows, given conditions as, 

B→1s22s(2)2p2

As, B has principal quantum number 3 for last electron and it has 7 electrons in valence shell. Thus, the compound will be,

BF3

Question Image

 Thus, the bond angle in compound of A and B (containing single central atom) will be 120 degree.

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