Question

1. The substance which turns blue to red litmus. What is that substance ? [ ]

a) Base b) Acid c) Salt d) None

2. The substance which turns red to blue litmus. What is that substance ? [ ]

a) Acid b) Base c) Salt d) All

3. An indicator which is obtained from the association of fungus and algae [ ]

a) China rose b) Turmeric c) Phenolphthalein d) Litmus

4. The source of acetic acid is [ ]

a) Oxalic acid b) Vinegar c) Tartaric acid d) All

5. Which of the following is an organic acid ? [ ]

a) Acetic acid b) Tartaric acid c) Oxalic acid d) All

6. Acid produced by some ants [ ]

a) Oxalic acid b) Tartaric acid c) Formic acid d) Ascorbic acid

7. Special type of substances used to test whether a substance is acidic/basic are known as[ ]

a) Indicators b) Acids c) Bases d) All the above

8. Which of the following contains oxalic acid [ ]

a) Lemon b) Vinegar c) Spinach d) All

9. Which of the following is used to glass cleaners. [ ]

a) Calcium hydroxide b) Ammonium hydroxide

c) Magnesium hydroxide d) Sodium hydroxide

10. The source of Lactic acid is [ ]

a) Buttered milk b) Curd c) Both a and b d) None​

Answer 1

Answer:

4 ka (c) vinegar hoga or 7 ka a indicator

Answer 2

1. When blue litmus is added to a solution and it changes to red that means it’s acidic in nature
b) Acid

2. Similarly when red litmus is added to a solution and it changes to blue the solution is basic in nature
b) Base
3. Lichen
4. Vinegar