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Q.

When magnesium ribbon burns with a dazzling flame in presence of oxygen, the white substance formed is-

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a

Magnesium oxide

b

Magnesium dioxide

c

Magnesium sulphate

d

Magnesium hydroxide

answer is A.

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Detailed Solution

When metals react with oxygen present in the air, they form metal oxides. Magnesium upon reacting with oxygen produces a dazzling flame and forms a white powder of magnesium oxide which is also called magnesia.

The reaction involved is-

2Mg + O2 → 2MgO

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