Q1 of 34 Page 22

Why should curd and sour substances not be kept in brass and copper vessels?

Curd and other sour substances contain acids. When these substances are kept in brass and copper vessels, the acid reacts with metal and liberated hydrogen gas and other harmful substances which may spoil these substances.


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1

You have been provided with three test-tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test-tube?

 2

Which gas is usually liberated when an acid reacts with a metal? Illustrate with the help of an example. How will you test the presence of this gas?

 3

Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

 1

Why do HCl, HN03 etc., show acidic character in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?