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Question

When magnesium ribbon is burnt in air, then identify the type of reaction and colour of ash formed.


A

Colour of ash formed:- Black

Type of reaction:- Decomposition

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B

Colour of ash formed:- White

Type of reaction:- Decomposition

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C

Colour of ash formed:- Yellow

Type of reaction:- Decomposition

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D

Colour of ash formed:- White

Type of reaction:- Combination

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Solution

The correct option is D

Colour of ash formed:- White

Type of reaction:- Combination


When magnesium ribbon is burnt in air then it will form magnesium oxide MgO powder which is white in colour. It is a combination reaction as magnesium and oxygen combine to form magnesium oxide.

2Mg(s) + O2(g) 2MgO(s)


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