Select the correct statement(s): (a) Diamond is hard while graphite is soft and slippery (b) The...

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Select the correct statement(s):
(a) Diamond is hard while graphite is soft and slippery
(b) The degree of covalency in the following compounds runs as \( \mathrm{HgX}_{2}\mathrm{CdX}_{2}\mathrm{ZnX}_{2} \)
(c) \( \mathrm{Zns} \) is white, CdS is yellow, while \( \mathrm{HgS} \) is black
(d) Diamond is soft while graphite is hard
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