Q. An oxide is acidic and has a pungent odour. It could be
✅ Correct Answer: (D)
nitrogen dioxide
Acids, Bases and Salts MCQs with answers
Dear candidates you will find MCQ questions of 7th Class - Science | Chapter: Acids, Bases and Salts here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
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Q. The correct way of making a solution of acid in water is to
✅ Correct Answer: (B)
add acid to water
Q. Products of a neutralisation reaction are always:
✅ Correct Answer: (C)
a salt and water
Q. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.
✅ Correct Answer: (B)
Yellow in acid and red in base
Q. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:
✅ Correct Answer: (D)
colourless and pink
Q. On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
✅ Correct Answer: (C)
Either acidic or neutral
Q. When CO2 gas is passed through limewater, it turns milky. Which of the following compounds is responsible for this milkiness
✅ Correct Answer: (D)
Calcium carbonate
Q. The reaction in which an acid react with a base to form salt and water is called as
✅ Correct Answer: (C)
Neutralisation reaction
Q. Which of the following ion is responsible for the acidic nature of hydrochloric acid ?
✅ Correct Answer: (A)
Hydrogen ion
Q. Which one of the following salts is used for making detergent powder?
✅ Correct Answer: (A)
Washing soda
Q. An antacid tablet is given to a person when he suffers from
✅ Correct Answer: (B)
acidity
Q. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
✅ Correct Answer: (A)
Organic matter
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