Explain the following (a) Reactivity of Al decreases if it is dipped in HNO_3 (b) Carbon cannot r...

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Explain the following
(a) Reactivity of Al decreases if it is dipped in HNO_3
(b) Carbon cannot reduce the oxides of Na or Mg
(c) NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state
(d) Iron articles are galvanised.
(e) Metals like Na, K, Ca and Mg are never found in their free state in nature.

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