Assertion :Reactivity of aluminium decreases when it is dipped in nitric acid. Reason: A protective layer of aluminium nitrate is formed when aluminium is dipped in nitric acid.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The reactivity of aluminium decreases when it is dipped in $H N O_{3}$ because $H N O_{3}$ is a good oxidizing agent. It oxidizes aluminium and forms a protective layer of aluminium oxide $A l_{2} O_{3}$ on the surface.

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{SiO}_{2}

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

C r_{2} O_{3}

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