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Electronic configuration of four elements A, B, C and D are given below : (A) 1s 2 2s 2 2p 3 (B) 1s 2 2s 2 2p 4 (C) 1s 2 2s 2 2p 5 (D) 1s 2 2s 2 2p 2 Which of the following is the correct order of increasing electronegativity (Pauling’s scale)?

1. A < C < B < D
2. A < B < C < D
3. D < A < B < C
4. A < D < B < C

Correct answer: D < A < B < C

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