A magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance ' X '. The X is:

Correct option is B

When a magnesium ribbon burns in the presence of oxygen, it reacts vigorously, producing a bright dazzling flame. The reaction forms magnesium oxide (MgO) as the product, a white solid.

Reaction:

$$2Mg+O_2\ \ \ \underrightarrow{\small{Burning}}\ \ \ 2MgO$$​

• MgO is a white substance formed due to the combination of magnesium (Mg) with oxygen (O₂).
• This is an oxidation reaction where magnesium is oxidized.

Key Facts:

·         Magnesium burns with an intense white flame due to its high reactivity with oxygen.

·         The product, magnesium oxide (MgO), is a basic oxide.

·         MgO reacts with water to form magnesium hydroxide (Mg(OH)₂, which is alkaline.

·         This reaction is commonly observed in laboratories as a demonstration of a metal reacting with oxygen.