Chromium and manganese oxides are reduced to metals by using:

aluminium

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iron

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silver

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chromium

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Solution

The correct option is A aluminium
Thermite is a pyrotechnic composition of metal powder, fuel, and metal oxide. When ignited by heat, thermite undergoes an exothermic redox reaction.

Aluminum is used as fuel because of its high boiling point and oxidizer include chromium(III) oxide, manganese(IV)oxide, iron(II, III)oxide.

Hence, option A is correct.

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Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin and Copper etc. are reduced by using

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