Q20 of 35 Page 42

What is the use of keeping food in air tight containers? (AS7)

The use of keeping food in air tight containers is to prevent oxidation and to slow down the oxidation process, otherwise the food undergoes oxidation and becomes rancid.


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17

Balance the chemical equation by including the physical states of the substances for the following reactions. (AS1)

Sodium hydroxide reacts with hydrochloric acid to produce sodium chloride and water.

 17

Balance the chemical equation by including the physical states of the substances for the following reactions. (AS1)

Zinc pieces react with dilute hydrochloric acid to liberate hydrogen gas and forms zinc chloride.

 18

A shiny brown colored element 'X' on heating in air becomes black in colour. Can you predict the element ‘X’ and black colored substance filmed? How do you support your predictions? (AS2)

 19

Why do we apply paint on iron articles? (AS7)