Which is polymeric hydride? (a) \( \mathrm{CaH}_{2} \) (b) \( \mathrm{MgH}_{2} \) (c) \( \mathrm...

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Which is polymeric hydride?
(a) \( \mathrm{CaH}_{2} \)
(b) \( \mathrm{MgH}_{2} \)
(c) \( \mathrm{BaH}_{2} \)
(d) \( \mathrm{SrH}_{2} \)
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