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  1. Consider the following pairs of ions or atoms
    1. Na+ and NC
    2. Na+ and K+
    3. K+ and C-
    In which of these pair are the ions/atoms iso-electronic with each other ?
    1. 1, 2 and 3
    2. 1 and 2
    3. 2 and 3
    4. 1 and 3
Correct Option: D

NA


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