Question

Assertion- When the metals react with oxygen to produce metallic oxide. Which results, the red litmus change into blue. Reason- the metallic oxides are generally basic in nature.
1.both assertion and reason are correct and reason is the correct explaination for assertion.
2.both assertion and reason are correct and reason is not the correct explanation for assertion.
3.assertion is correct but reason is incorrect.
4.both assertion and reason are incorrect.​

Answer 1

Answer:

The oxides of metal are basic in nature or in other words they react with acids to form salt and water. In the case of non-metals, they are acidic in nature to form acids when they dissolve in water.

When sulphur dioxide is dissolved in water sulphurous acid is formed. The reaction can be given as follows:

SO

2+H 2O→H 2

SO

3

The sulphurous acid turns blue litmus paper red.

Answer 2

1.both assertion and reason are correct and reason is the correct explaination for assertion is correct answer with respect to mentioned point regarding metallic oxide.

• Metals are characterized by ability to conduction of heat and electricity etc. Their oxides are basic in nature.
• This is evident from the litmus change.
• Another evidence is release of hydroxide ions on reaction of metallic oxide with water, which changes the solution to basic.
• Example of metallic oxide with basic nature are sodium oxide, magnesium oxide.