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The ratio between the neutrons in C and Si with respect to atomic masses 12 and 28 is:
(1) 2 : 3
(2) 3 : 2
(3) 3 : 7
(4) 7 : 3
Ans: 3 : 7
Which of the following are isoelectronic species I= CH + 3 , II-NH 2 , III- NH + 4 , IV-NH 3 (1) I, II, III (2) II, III, IV (3) I, II
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