Graphite is a good conductor of electricity. Give reason.

Carbon tetrachloride is not a good conductor of electricity give reason to justify your answer . .

Write any two good conductors of electricity.

Give reasons for the following : (i) Metals are good conductors of electricity whereas non-metals are not. (ii) Ionic compounds have usually high melting and boiling points.

Name any two poor conductors of electricity.

Give reason : (i) Ionic compounds in solid state do not conduct electricity, whereas in molten state are good conductors of electricity. (ii) Silver articles when exposed to air gradually turn blackish. (iii) Chemical reaction does not take place when copper is added to iron sulphate solution.

A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, where as Z is a good conductor of electricity. Identify X, Y and Z.

Which one of the following is a good conductor of electricity ?

Give reasons : i) lonic compounds in solid state do not conduet electricity, whereas in molten state are good conductors of electricity. (ii) ii) Silver articles when exposed to air gradually turn blackish. ii) Chenmical reaction does not take place when copper is added to iron sulphate solution.