EASY
7th Punjab Board
IMPORTANT
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Indicator is a substance which shows different colors in acidic and basic solutions.

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Important Questions on Acids, Bases and Salts

EASY
7th Punjab Board
IMPORTANT
Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 6
Tooth decay is caused by the presence of a base.
MEDIUM
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?
MEDIUM
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.
MEDIUM
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.
MEDIUM
7th Punjab Board
IMPORTANT
Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 8
Explain why factory waste is neutralized before disposing it into the water bodies.
HARD
7th Punjab Board
IMPORTANT
Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 9
Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and the third is a sugar solution. How will you identify them? You have only turmeric indicator.
MEDIUM
7th Punjab Board
IMPORTANT
Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 10
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
MEDIUM
7th Punjab Board
IMPORTANT
Science>Chapter 5 - Acids, Bases and Salts>Exercises>Q 11
Consider the following statements:
(A) Both acids and bases change colour of all indicators.
(B) If an indicator gives a colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?