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Control And Coordination

Question

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A student puts a drop of the reaction mixture of a saponification reaction first on a blue litmus paper and then on red litmus paper. He may observe that:

There is no change in the blue litmus paper and the red litmus paper turns white.

There is no change in the red litmus paper and the blue litmus paper turns red.

There is no change in the blue litmus paper and the red litmus paper turns blue.

No change in colour is observed in both the litmus papers.

Solution

C.

There is no change in the blue litmus paper and the red litmus paper turns blue.

Some More Questions From Control and Coordination Chapter

What is a neutralization reaction? Give some examples.

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.

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