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   NAF  AL2O3   MGF2 TIO2

6 years ago


Answers : (1)

										hardness depends upon d covalency or d covalent strength of d cov bonds. all hard substances r brittle because in d absence of ionicity d molecules slip easily. in case of polymers de r plastic because in dem thr is nothing apart frm d strong n higly durable covalent bonds

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2 years ago

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