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Why should a magnesium ribbon be cleaned...

Why should a magnesium ribbon be cleaned before burning in air?

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Magnesium ribbon is cleaned before burning so that coating of impurity (such as oxide) formed on its surface is removed and it becomes pure magnesium.
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Assertion (A) : Magnesium ribbon is cleaned with water before burning . Reason (R ) : MgO layer is formed on magnesium ribbon , on exposure to atmosphere .

A burning magnesium ribbon will continue to burn in

(a) Define the following in terms of gain or loss of hydrogen with one example each: (i) oxidatin (ii) reduction (b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reactin. Name (i) substance oxidised, and (ii) substance reduced.

Why does magnesium ribbon start floating in hot water?

Magnesium ribbon on burning in air produces

What happens when a magnesium ribbon is heated in presence of air?

MTG IIT JEE FOUNDATION-CHEMICAL REACTIONS AND EQUATIONS-NCERT SECTION
  1. Why should a magnesium ribbon be cleaned before burning in air?

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  12. Identify the substances that are oxidized and the substances that are ...

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  13. Identify the substances that are oxidised and the substances that are ...

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