Magnesium ribbon burns with a dazzling white flame and changes into a white powder. What is the chemical name of this white powder?

Explanation

Burning magnesium in oxygen gives a dazzling white flame and forms a white ash of magnesium oxide, MgO:

2Mg+O_2→2MgO.
Magnesium sulphate, hydroxide and chloride are not the direct products of burning magnesium ribbon in air.