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What is efflorescence?

Solution

Crystals of certain substances lose water and turn into a powder. For example, Na₂CO₃ · 10H₂O crystals on being left in the open turn into powder, Na₂CO₃· This giving up of water of crystallization by crystals to the atmosphere is termed as efflorescence

Some More Questions From Control and Coordination Chapter

What are non-metallic oxides? Substantiate your answer.

Take 5 ml hydrochloric acid in a boiling tube or a conical flask. Add a few pieces of zinc granules to it.

(a) What do you observe on the surface of zinc granules?
(b) Name the gas evolved.
(c) What happens when the above gas is passed through soap solution?
(d) What happens when a burning candle is brought near the gas filled tube?

Name four acids and bases. Write their formulae.

Name the various kind of oxides and mention their properties.

What are acids? How are they produced?

Mention important characteristics of acids.

Why the vessels of copper and brass need ‘Kalai’?

How can you test the presence of an acid in any substance?

Why are acids not stored in metal containers? Containers/vessels made from which material are safe to store acids.

A solution turns red litmus paper blue. What does this indicate about the chemical nature of the solution?

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