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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