Subjectwise Questions - Chemicals

1. Which of the following acids is contained in the sting of bees and wasps

  1. formic acid
  2. acetic acid
  3. oxalic acid
  4. hydrochloric acid

2. The enzyme that converts glucose to ethyl alcohol is -

  1. Invertase
  2. Maltase
  3. Zymase
  4. Diastase

3. A ‘breath test’ used by traffic police to check drunken driving uses ----

  1. Potassium dichromatic-sulphuric acid
  2. potassium permanganate-sulphuric acid
  3. Turmeric on filter paper
  4. Silica gel coated with silver nitrate

4. Which of the following is the chief constituent of vinegar?

  1. oxalic acid
  2. formic acid
  3. citric acid
  4. acetic acid

5. Which of the following acids is used in a car battery?

  1. hydrochloric acid
  2. sulphuric acid
  3. nitric acid
  4. carbonic acid

6. Leakage of which of the following gases caused the Bhopal gas tragedy?

  1. Carbon monoxide
  2. Methyl isocyanate
  3. Hydrogen sulphide
  4. Nitrous oxide

7. Formalin is generally used as an

  1. antiseptic
  2. anaesthetic
  3. stimulant
  4. preservative

8. Which of the following chemicals is added to LPG to give out a strong smell?

  1. Ethyl mercaptan
  2. Dichloro diflouro methane
  3. Hydrogen sulphide
  4. Ammonia

9. The sour taste of curd is due to the presence of which of the following constituents?

  1. acetic acid
  2. lactic acid
  3. formic acid
  4. citric acid

10. Which of the following chemicals used in photography is also known as hypo?

  1. silver bromide
  2. silver iodide
  3. sodium thiosulphate
  4. silver nitrate

11. Phenyl, commonly used in toilets is closely related to -

  1. Benzene
  2. Sulphuric Acid
  3. Sodium Thiosulphate
  4. Tetrachloroethylene

12. The natural dye present in turmeric is known as

  1. Curcumin
  2. Cinnamin
  3. Phenolphthalein
  4. Methyl Orange

13. Which one of the following elements is used in the manufacture of fertilizers?

  1. Flourine
  2. Lead
  3. Potassium
  4. Aluminium

14. Which one of the following is used to induce artificial rain?

  1. Ammonium chloride
  2. Calcium carbonate
  3. Silver lodide
  4. Potassium Nitrate

15. Nail polish remover contains

  1. benzene
  2. acetone
  3. petroleum
  4. acetic acid

16. By what name is Acetylsalicylic Acid better known?

  1. Vinegar
  2. Brine
  3. Saltpeter
  4. Aspirin

17. What is the role of catalyst in a chemical reaction?

  1. It increases the rate of reaction
  2. It decreases the rate of reaction
  3. It increases the yield of products
  4. It provides better purity of products

18. What is the mixture of potassium nitrate, powdered charcoal and sulphur called?

  1. glass
  2. cement
  3. paint
  4. gun powder

19. When iron is left exposed in open air, it gets rusted. Which constituents(s) of air is/are responsible for rusting iron?

  1. Oxygen gas present in air
  2. Moisture present in air
  3. Carbon dioxide gas present in air

Select the correct answer using the code given below

  1. 1 and 2 only
  2. 1 only
  3. 2 and 3 only
  4. 2 only

20. Which one of the following is extensively used for sterilizing water?

  1. Bleaching powder
  2. Alum
  3. Borax powder
  4. Soda powder

21. Which one among the following substances evolves heat when dissolved in water?

  1. Potassium nitrate
  2. Calcium oxide
  3. Glucose
  4. Sodium chloride