Practical chemistry

Front

What gas is evolved when dilute Sulphuric acid reacts with sodium sulphite?

Back

Sulphur dioxide.

Front

What indicates the presence of nitrate ion when a freshly prepared solution of ferrous sulphate is added to a salt solution and concentrated sulphuric acid is poured gently?

Back

A brown ring is formed.

Front

What is the color of nitrogen dioxide?

Back

Reddish brown.

Front

Which hydroxide is soluble in excess sodium hydroxide?

Back

Zn(OH)₂.

Front

What is the confirmatory test for nitrogen dioxide?

Back

Turns acidified ferrous sulphate solution brown.

Front

Define dilute sulphuric acid.

Back

A solution of sulphuric acid with a lower concentration, often used in reactions.

Front

What is the chemical formula for sodium sulphite?

Back

Na₂SO₃.

Front

What is the appearance of sulphur dioxide gas?

Back

Colorless gas with a pungent smell.

Front

What happens when zinc hydroxide is added to excess sodium hydroxide?

Back

It dissolves to form sodium zincate.

Front

What is the role of concentrated sulphuric acid in the brown ring test?

Back

It acts as a dehydrating agent and helps in the formation of the brown ring.