Which does not show electrical conductance?

Sodium

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Diamond

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Potassium

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Graphite

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Solution

The correct options are
B Diamond
D Graphite
Sodium, potassium and Graphite all three are electrical conductor except Diamond which is an insulator of electric current.

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(a) Why do acids not show acidic behavior in the absence of water?

(b) Why does an aqueous solution of an acid conduct electricity?

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