1. An oxide is acidic and has a pungent odour. It could be

2. Out of these gases which one is used in fire extinguishers

3. The correct way of making a solution of acid in water is to

4. Products of a neutralisation reaction are always:

5. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed.

6. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are:

7. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

8. Which of the following set of substances contain acids?

9. On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

10. Which of the following is an acid-base indicator?