Assertion :In thermite welding, aluminium powder and $F e_{2} O_{3}$ are used. Reason: Aluminium powder is a strong reducing agent.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
1) In the thermite welding generally is used for its heat that is produced due to aluminium reduction of iron.so the reason is not complete.
2) Aluminium dust reduces the oxide of another metal, most commonly iron oxide because aluminium is highly reactive.

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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

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