Question

Select from the following a statement which is not true about burning of magnesium ribbon in air:

Options

• It burns with a dazzling white flame.

• A white powder is formed on burning.

• It is an endothermic reaction.

• It is an example of a combination reaction.

Answer 1

It is an endothermic reaction.

Explanation:

Magnesium burns in air with a dazzling white flame, forming magnesium oxide (MgO), while releasing significant heat energy

\[\ce{2Mg_{(S)} + O2_{(g)} -> 2MgO_{(s)} + Heat energy}\]

A white powder (MgO) is created is true. The reaction is exothermic, not endothermic, as it releases heat. Magnesium interacts with oxygen to produce a single product (MgO).