HARD
7th CBSE
IMPORTANT
Earn 100

Turmeric stains on white clothes are yellow. Why do these stains turn red when they are washed with soap?

Important Questions on Acids, Bases and Salts

MEDIUM
7th CBSE
IMPORTANT
The Science Hub>Chapter 6 - Acids, Bases and Salts>Exercises>Q 2
The waste of many factories contains acids. Why is it necessary to neutralise them before allowing the waste to flow into waterbodies?
HARD
7th CBSE
IMPORTANT
The Science Hub>Chapter 6 - Acids, Bases and Salts>Exercises>Q 3
Many advertisements claim that it is better to use a facewash rather than a soap to wash your face. Why do you think soap is harmful to our skin?
HARD
7th CBSE
IMPORTANT
The Science Hub>Chapter 6 - Acids, Bases and Salts>Exercises>Q 4
Bacteria releases acids in the mouth by fermentation of food particles stuck between the teeth and causes cavities. What role does a toothpaste play in reducing this harmful effect and protecting the teeth?
HARD
7th CBSE
IMPORTANT
The Science Hub>Chapter 6 - Acids, Bases and Salts>Exercises>Q 5

Look at the reaction below. Decide if the product will be acidic, basic or neutral.

  • Strong acid + strong base
EASY
7th CBSE
IMPORTANT
The Science Hub>Chapter 6 - Acids, Bases and Salts>Exercises>Q 5

Look at the reaction below. Decide if the product will be acidic, basic or neutral.

  • Weak acid + strong base
MEDIUM
7th CBSE
IMPORTANT
The Science Hub>Chapter 6 - Acids, Bases and Salts>Exercises>Q 5

Look at the reaction below. Decide if the product will be acidic, basic or neutral.

  • Strong acid + weak base