Which of the following have \( X-\mathrm{O}-X \) linkage? (where \( X \) is central atom) : (i) ...

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Which of the following have \( X-\mathrm{O}-X \) linkage? (where \( X \) is central atom) :
(i) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)
(ii) \( \mathrm{S}_{2} \mathrm{O}_{3}^{2-} \)
(iii) Pyrosilicate
\( P \)
(a) (i) (iii)
(b) (iiii) (iv)
(c) (i) (iii) (iv)
(iv) Hyponitrous acid
W
(d) (i) (ii)
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