If the ratio of co-ordination no. \( \mathrm{P} \) to that of \( \mathrm{Q} \) be \( \mathrm{Y}:...

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If the ratio of co-ordination no. \( \mathrm{P} \) to that of \( \mathrm{Q} \) be \( \mathrm{Y}: \mathrm{Z} \), then the formula of the solid is
(a) \( \mathrm{P}_{\mathrm{y}} \mathrm{Q}_{\mathrm{z}} \)
(b) \( \mathrm{P}_{\mathrm{z}} \mathrm{Q}_{\mathrm{y}} \)
(c) \( \mathrm{P}_{1 / \mathrm{y}} \mathrm{Q}_{1 / \mathrm{z}} \)
(d) None of these
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