NCERT Exemplar: Long answer questions II — task. Science CBSE, Class 10.

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Explain the following:

a. Reactivity of \(Al\) decreases if it is dipped in \(HNO_3\).

It is due to the formation of a nitrogen oxide layer on its surface.
It's because an oxide layer is formed on its surface.
Hydrogen gas formation decreases the reactivity of \(Al\).
The reactivity of \(Al\)

b. Carbon cannot reduce the oxides of \(Na\) or \(Mg\).

It is because carbon is a non-metal and \(Na\) and \(Mg\) are metals.
The reactivity of carbon is more than \(Na\) or \(Mg\).
\(Na\) or \(Mg\) are strong oxidising agents.
Because \(Na\) or \(Mg\) are strong reducing agents.

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