Q19 of 35 Page 42

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

We apply paint on iron articles to prevent the corrosion and rusting of iron. It decreases the rate of the process of rusting of iron.


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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)

 20

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