Question

QUESTIONS
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Why should a magnesium ribbon be cleaned before burning
te the balanced equation for the following chemical reactions?
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Answer 1

Answer:

to remove the magnesium oxide layer which was formed earlier as magnesium oxide. it prevents the magnesium ribbon from further Reactions

Answer 2

Magnesium ribbon must be cleaned before burning because at ordinary temperature it forms a thin oxide layer which prevent it from further oxidation or burning.

The reaction taking place is following:-

2Mg + O2 = 2 MgO