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Aluminium vessels should not be washed with materials containing ashes of the cow dung or wooden material because

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Cow dung is expensive

Cow dung has no property of cleansing

Ashes of cow dung or wooden materials react with aluminium to form soluble aluminium compounds.

Ashes of cow dung or wooden material react with aluminium to form insoluble aluminium oxide.

answer is C.

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Detailed Solution

Plant materials contain potassium. So the cow dung or the wooden materials also contain
potassium which form as potassium oxide with in the ash. This potassium oxide water forms KOH, which react with aluminium forming soluble aluminates.

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