1. Avogadro’s number is
[a] 6.02x10²⁴
[b] 6.20x10²⁴
[c] 6.02x10²³
[d] 6.20x10²⁴

2. 1 and is defined as the mass equal to 1/12th of the mass of an atom of
[a] ¹²C
[b] ¹³C
[c] ¹H
[d] ²H

3. Uncertainty Principle is proposed by
[a] de Broglie
[b] Bohr
[c] Max Plank
[d] Heisenberg

4. Water has maximum density at
[a] 0°C
[b] 4°C
[c] 100°C
[d] 40°C

5. H₂O exists as a liquid due to the presence of
[a] Ionic bond
[b] London Forces
[c] Hydrogen Bond
[d] Co-ordinate bond

6. The most abundant element in the human body is
[a] Oxygen
[b] Hydrogen
[c] Carbon
[d] Nitrogen

7. The polymer used to make nonstick utensils is
[a] Freon
[b] Teflon
[c] Bakelite
[d] Polythene

8. An example of a secondary cell is
[a] Dry cell
[b] Mercury cell
[c] lead storage cell
[d] Both [a] & [b]

9. Who proposed the Law of Octaves?
[a] Newlands
[b] Dobereiner
[c] Lavoisier
[d] Mosely

10. Which of the following is known as Slaked Lime?
[a] Calcium Oxide
[b] Calcium Carbonate
[c] Calcium Hydroxide
[d] Calcium Phosphate

11. CaSO₄.2H₂O is the chemical formula of
[a] Gypsum
[b] Plaster of Paris
[c] Caustic Soda
[d] Baking Soda

12. The elements in the 17th group of the modern periodic table are also known as
[a] Halogens
[b] Noble Gases
[c] Transition Elements
[d] Alkaline Earth Metals

13. The most abundant element in the universe is
[a] Helium
[b] Hydrogen
[c] Nitrogen
[d] Oxygen

14. The molecular formula of Baking Soda is
[a] Na₂CO
[b] NaOH
[c] NaCl
[d] NaHCO₃

15. Sodium Carbonate is generally prepared by
[a] Castner- Kellner Process
[b] Contact Process
[c] Solvay Process
[d] Haber Process

16. Which of the following is not a greenhouse gas?
[a] Water vapour
[b] Hydrogen
[c] Ozone
[d] Chlorofluorocarbon

17. Green Chemistry deals with
[a] Production of green coloured dyes
[b] reduction in the production of pollutants
[c] reduction in the time of chemical synthesis
[d] enhanced production in agriculture

18. Minamata disease is caused due to the poisoning of
[a] Cadmium
[b] Arsenic
[c] Mercury
[d] Zinc

19. International Mole day is celebrated on
[a] September 23
[b] October 23
[c] November 23
[d] December 23

20. Modern periodic table contains
[a] 7 groups and 18 periods
[b] 18 groups and 7 periods
[c] 8 groups and 17 periods
[d] 17 groups and 8 periods.