Which of the following are isostructural pairs? I. \( \mathrm{SO}_{4}^{2-} \) and \( \mathrm{CrO...

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Which of the following are isostructural pairs?
I. \( \mathrm{SO}_{4}^{2-} \) and \( \mathrm{CrO}_{4}^{2-} \)
II. \( \mathrm{SiCl}_{4} \) and \( \mathrm{TiCl}_{4} \)
III. \( \mathrm{NH}_{3} \) and \( \mathrm{NO}_{3}^{-} \)
IV. \( \mathrm{BCl}_{3} \) and \( \mathrm{BrCl}_{3} \)
(a) III and IV only
(b) I and II only
(c) I and III only
(d) II and III only
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