Multiple Choice Question Answer XXXXI — task. Science CBSE, Class 9.

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1. The triad of nuclei that is isotonic is -

\(_{6}^{14}\textrm{C}\), \(_{7}^{15}\textrm{N}\), \(_{9}^{17}\textrm{F}\)
\(_{6}^{14}\textrm{C}\), \(_{7}^{14}\textrm{N}\), \(_{9}^{19}\textrm{F}\)
\(_{6}^{14}\textrm{C}\), \(_{7}^{14}\textrm{N}\), \(_{9}^{17}\textrm{F}\)
\(_{6}^{12}\textrm{C}\), \(_{7}^{14}\textrm{N}\), \(_{9}^{19}\textrm{F}\)

2. Pick out the isoelectronic structures from the following -
(I). \(CH_3{^+}\) (II). \(H_3O^+\) (III). \(NH_3\) (IV). \(CH_3{^-}\)

I and III
III and IV
II, III, IV
I and II

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