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Question 16

The electronic configurations of the elements A, B and C are given below. Answer the question on the basis of these configurations.

A 1s2 2s2 2p6

B 1s2 2s2 2p6 3s2 3p3

C 1s2 2p6 2p6 3s2 3p5

The molecular formula of the compound formed from B and C will be

(a) BC

(b) B2C

(c) BC2

(d) BC3

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Solution

Answer: (d).

The electronic configuration shows that B represents phosphorus and C represents chlorine. The stable compound formed is PCl3 i.e.,BC3


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