Which of the following are observed when magnesium ribbon is burnt?

Endothermic reaction

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Exothermic reaction

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Dazzling white flame

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Dazzling red flame

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Solution

The correct options are
B Exothermic reaction
C Dazzling white flame
The reaction between magnesium ribbon ( $Mg$ ) and oxygen ( $O_{2}$ ) to form magnesium oxide ( $MgO$ ) is a type of combination reaction as two reactants are combining together to form single product. The reaction involved is:

$2Mg(s) + O_{2} (g) \to 2MgO(s)$

The magnesium ribbon burns with a dazzling white flame along with the evolution of heat. Hence, this reaction is exothermic in nature.

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i. Magnesium ribbon undergoes oxidation reaction.
ii. Magnesium reacts with air to form magnesium oxide.
iii. Magnesium ribbon undergoes decomposition reaction.

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