Question

A student performs an experiment of burning magnesium ribbon in the air. A chemical reaction takes place and as a result, a white powder X forms along with a bright white light.

The aqueous solution of X changes _________.

• A. red litmus to blue
• B. blue litmus to red
• C. red litmus to colourless
• D. blue litmus to colourless

Answer 1

The correct option is A red litmus to blue

Magnesium reacts with oxygen present in air and burns to produce powder of magnesium oxide(X) which is white in colour along with a bright flame.

Oxides of metals like magnesium are basic in nature. Aqueous solution of these oxides turn red litmus to blue.