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    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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    d)H2CO3

    Which of the following have covalent, coordinate and ionic all three type of bonds -
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