Q4 of 11 Page 56

Is the distilled water acidic/basic/neutral? How would you verify it?

The solutions which do not change the colour of either red or blue litmus are known as neutral solutions. When the nature of distilled water is tested with litmus paper, we have found neither red nor blue changes in the colour which verify its neutral nature.


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2

Ammonia is found in many house-hold products, such as window cleaners. It turns red litmus blue. What is its nature?

 3

Name the source from which litmus solution is obtained. What is the use of this solution?

 5

Describe the process of neutralization with the help of an example.

 6

Mark “T” if the statement is true and “F” if it is false:

i. Nitric acid turns red litmus blue. (T/F)


ii. Sodium hydroxide turns blue litmus red. (T/F)


iii. Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)


iv. Indicator is a stub stance which shows different colours in acidic and basic solutions. (T/F)


v. Tooth decay is caused by the presence of a base. (T/F)