The white powder formed when magnesium ribbon burns is-

Correct option is D

The correct answer is (d) Magnesium oxide.
· When magnesium ribbon burns, it reacts with oxygen to form magnesium oxide ( MgO), which is a white powder.
· The reaction is highly exothermic, producing a bright white flame.
· Magnesium oxide is used in medicine as a laxative and antacid.
· MgO is also used in the construction industry for fireproofing and heat insulation.
· The chemical equation for the reaction is: 2Mg + O₂ → 2MgO.
· This oxide has basic properties and reacts with water to form magnesium hydroxide.
Additional Knowledge:
· Magnesium carbonate: Known as MgCO₃, it is used in sports as a drying agent for hands and in the pharmaceutical industry.
· Magnesium hydroxide: Also called milk of magnesia, it is used as an antacid and laxative.
· Magnesium sulphate: Commonly known as Epsom salt ( MgSO₄), it is used in agriculture and as a bath salt for soothing muscles.