Question

why should a magnesium ribbon be cleaned before burning in air

Answer 1

Here is the required answer:-

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Answer 2

Magnesium ribbon should be cleaned before burning in air to remove the basic magnesium carbonate coating in it. This layer should be removed so that the ribbon may readily combine with oxygen while burning in air. Basic magnesium carbonate layer consists of magnesium carbonate and magnesium hydroxide.

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