Question

Give the chemical name and nature (acidic or basic) of the ash formed by the burning of a \[{\text{Mg}}\] ribbon in air?
A.Magnesium chloride, acidic
B.Magnesium nitrate, basic
C.Magnesium oxide, acidic
D.Magnesium oxide, basic

Answer 1

Hint: Magnesium is an element belonging to the second group of the periodic table. Thus, it is an alkaline earth metal and its properties are very similar to each other. It is a shiny, silver white solid. It has the symbol \[{\text{Mg}}\] and the atomic number 12.

Complete step by step answer:
Magnesium does not occur naturally in the free state. It occurs naturally in combination with other elements in which it exists in the +2 oxidation state. The free magnesium metal can be produced artificially and is found to be highly reactive.
The free magnesium metal is found to burn with a characteristic brilliant white light.
Magnesium acts as a source of light. When burning in air, magnesium in the ribbon form or the powder form produces a brilliant white flame. This white flame includes strong ultraviolet wavelengths.
The appearance of the white flame is because of the formation of magnesium oxide when magnesium burns in oxygen of air. The word equation can be written as:
${\text{Magnesium(Mg)}} + {\text{Oxygen(}}{{\text{O}}_{\text{2}}}{\text{)}} \to {\text{Magnesiumoxide(MgO)}}$
The corresponding chemical equation can be written as:
${\text{2Mg + }}{{\text{O}}_{\text{2}}} \to {\text{2MgO}}$
When the magnesium oxide formed by burning of magnesium ribbon in air is dissolved in water, it gives magnesium hydroxide which is basic in nature. So, magnesium oxide is a base.
${\text{MgO + }}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{Mg}}{\left( {{\text{OH}}} \right)_{\text{2}}}$

So, the correct option is D.

Note:
-Magnesium oxide is utilized as a refractory material in the linings of furnaces used for the production of iron, steel, glass, non-ferrous metals and cement.
-Along with other magnesium compounds, magnesium oxide is also used in construction, agricultural and chemical industries.
-The magnesium oxide obtained from calcinations is also used for electrical insulating of fire-resistant cables.