Question

Give reasons (i)Reactivity of Al decreases if it is dipped in HNO₃, (ii)NaCl is not a conductor of electricity in the solid-state whereas it does conduct electricity in aqueous solution as well as in the molten state. (iii)Metals conduct electricity

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Answer 1

Answer:

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Explanation:

(i) HNO_{3} is an oxidising agent. When aluminium is dipped in $HNO_{3}$ , an oxide layer (of aluminium) is formed on the surface of the metal, which prevents it from further reaction.

(ii) Ions of $NaCl$ cannot move to carry the charge in dry state due to electrostatic forces of attraction. But they are free in molten state and in aqueous solution to carry the charge and hence, $NaCl$ conducts electricity in molten state as well as in aqueous solution.

(iii) Na, Mg etc., metals are quite reactive and present at the top of the reactivity series. Hence, their affinity with oxygen is high and their oxides cannot be reduced by carbon.

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