Question

How will you check the basic nature of metals oxide ? ​

Answer 1

Answer:

Metallic oxides are basic in naturebecause they react with dilute acids to form salt and water. ... Therefore, nonmetallic oxides would be acidic innature. This can also be proven by the litmus paper test where metal oxideswhen reacting with water will form strong bases and turn red litmus paper to blue.

Answer 2

Answer-

Let's take an example of a metal: Magnesium (Mg).

Method:

1) Take a magnesium ribbon of about 3-4 cm and hold it with a pair of tongs and burn it using a bunsen burner.

2) Use an eye protection.

3) Collect the white ash so formed in a watch glass.

4) Now, add the ash in the water.

5) Take a red and blue litmus paper and try testing them.

Observations:

1) When Mg ribbon is burned, a dazzling white flame is produced along with the evolution of heat.

2) The ash formed is actually Magnesium oxide (MgO).

3) On adding MgO in water, Magnesium hydroxide [Mg(OH)₂] is formed.

4) On testing Mg(OH)₂ with red litmus paper, red litmus turns into blue. This shows its basic nature.

5) On testing Mg(OH)₂ with blue litmus paper, no change is seen.

Conclusion:

Thus, this activity shows how to check the basic nature of metal oxides.

Equations:

1) Mg + O₂ ------> 2MgO

2) MgO + H₂O --------> Mg(OH)₂