Sarthaks Test
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(a) Show the formation of Na2O by the transfer of electrons between the combining atoms. 

(b) Why are ionic compounds usually hard? 

(c) How is it that ionic compounds in the solid state do not conduct electricity but they do so when in molten state?

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(b) It is due to strong force of attraction between oppositely charged ions. 

(c) In solid state, ions are not free to move whereas in molten state ions are free to move, therefore, they conduct electricity in molten state.

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