Chemistry-
General
Easy

Question

The group of substances in which at melting point covalent bond breaks up-

  1. Nacl,KCl,CaCl2    
  2. I2(S),CH4(S), dryice    
  3. B4C,dimond,SiC    
  4. All of the above    

The correct answer is: B4C,dimond,SiC

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