Nitric acid turns red litmus blue.

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Important Questions on Acids, Bases and Salts

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 6

Sodium hydroxide turns blue litmus red.

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 6

Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water.

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 6

Indicator is a substance which shows different colors in acidic and basic solutions.

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 6

Tooth decay is caused by the presence of a base.

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 7

Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 8

Explain why an antacid tablet is taken when you suffer from acidity.

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7th Punjab Board

IMPORTANT

Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 8

Explain why calamine solution is applied on the skin when an ant bites.

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7th Punjab Board