Question

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

Answer 1

Answer:

Magnesium ribbon must be cleaned before burning in the air so that the layer of magnesium oxide (which is formed due to the reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

Explanation:

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Answer 2

Answer:

Explanation:

$\bigstar$  Magnesium ribbon be cleaned before burning in air because when magnesium is kept outside the magnesium ribbon will develop a coating of (MgO) magnesium oxide.

$\bigstar$If the ribbon is covered by magnesium oxide it will not burn as we want it to.

$\bigstar$ Because this coating of magnisium oxide hinders the burning of magnisium ribbon.

$\bigstar$ Therefore it is removed from the magnesium ribbon normally by rubbing with a sandpaper.

Reaction when magnesium burns in air

Magnesium burns in the presence of oxygen present in the air to produce dazzling light and heat.

$\bigstar$ The Equation of Burning of magnesium ribbon:-

$2Mg+ O2 \longrightarrow 2 MgO$