Acids and Bases
Learn about acids, bases, alkalis, and their practical applications in industry, agriculture, and daily life.
Questions
Question 1 Multiple Choice (Single Answer)
For descaling boilers, ________ is used in industries for removing deposits from the inside of boilers.
- nitric acid
- dilute hydrochloric acid
- sodium hydroxide
- concentrated hydrochloric acid
- concentrated sulphuric acid
Question 2 Multiple Choice (Single Answer)
Bases that can dissolve in water are called ___________.
- preservatives
- alkalis
- antacids
- explosives
- indicators
Question 3 Multiple Choice (Single Answer)
Which of the following combinations of salts and their uses is incorrect?
- Sodium carbonate - In detergents
- Silver nitrate - To develop photographic films
- Calcium carbonate - In marbles for flooring
- Sodium bicarbonate - To make chalk
- Ammonium nitrate - In explosives
Question 4 Multiple Choice (Single Answer)
A lady took out her old gold jewellery to wear in a wedding. To give it a better shine, she gave it to a goldsmith, who put it into a solution and had it polished instantly. Which of the following was present in the solution?
- Magnesium sulphate
- Sulphuric acid
- Mercury
- Sodium hydroxide
- Nitric acid
Question 5 Multiple Choice (Single Answer)
A farmer was advised to add quick lime (calcium oxide) to the soil to grow the plants well. Why did he add quick lime?
- Because it neutralises the acidity.
- Because it is a fertiliser.
- Because it increases the uptake of fertilisers.
- Because it allows better water absorption by roots.
- Because it reduces the alkalinity of the soil.