Question

Q.5. Answer the following questions:
1. How can we show that the residue left after burning magnesium is basic in nature?​

Answer 1

$\huge\mathfrak{Question}$

How can we show that the residue left after burning magnesium is basic in nature ?

$\huge\mathfrak{Answer}$

Magnesium oxide changes the colour of red litmus paper to blue. This reaction shows that magnesium oxide is basic in nature.

Answer 2

Answer:

The ash which is collected after burning of magnesium ribbon is dissolved in water to give a solution X. What is the nature of the solution X when it is tested with indicators?

Explanation:

Mg+O

2

→MgO

Magnesium Oxygen Magnesium

oxide (ash)

MgO+H

2

O→Mg(OH)

2

Magnesium Water Magnesium

hydroxide

(X)

MgO+H

2

O→Mg(OH)

2

Magnesium Water Magnesium

oxide hydroxide

(X)

Mg(OH)_2 solution is basic in nature which turns red litmus blue and phenolphthalein pink.