PSC GK Questions and Answers

Chemistry General Knowledge [GK] Questions and answers for preparing all PSC, SSC and other Competitive Examinations.

ELEMENTS

1. Most abundant element in the Universe?

Answer: Hydrogen

2. Number of discovered elements?

Answer: 120

3. Names are given to ........ elements?

Answer: 112

4. 112th element in periodic table?

Answer: Coppernicium

5. 43rd element in periodic table?

Answer: Technetium

6. First artificial element?

Answer: Technetium

7. Lightest gas at S.T.P?

Answer: Hydrogen

8. Simplest element gas?

Answer: Hydrogen

9. Element Common to all acids?

Answer: Hydrogen

10. Most abundant element in the human body?

Answer: Oxygen

11. Most common element by weight in Earth’s crust?

Answer: Oxygen

12. Most ductile element?

Answer: Gold

13. Most conductive metal?

Answer: Silver

14. Most abundant metallic element in the human body?

Answer: Calcium

15. Most abundant element in the earth’s atmosphere?

Answer: Nitrogen

16. Most abundant metallic element in the earth’s crust?

Answer: Aluminium

17. The metal most used for house hold purpose?

Answer: Aluminium

18. The metal contained in clay?

Answer: Aluminium

19. The heaviest gaseous element?

Answer: Radon

20. Rarest element in the earth’s atmosphere?

Answer: Radon

21. Heaviest noble gas?

Answer: Radon

22. Element stored in Kerosene to prevent oxidation?

Answer: Sodium

23. The lightest metal element?

Answer: Lithium

24. Least dense metal?

Answer: Lithium

25. Least stable radioactive Isotope?

Answer: Lithium-5

26. The rarest naturally occurring element in the earth’s crust?

Answer: Astatine

27. Element with highest melting and boiling points?

Answer: Tungsten

28. Element used to make electric bulb filament?

Answer: Tungsten

29. Which is known as ‘wolfram’?

Answer: Tungsten

30. Highest thermal expansion?

Answer: Caesium

31. A bleaching agent?

Answer: Chlorine

32. The second most chemically active element?

Answer: Chlorine

33. The densest element?

Answer: Osmium

34. Most chemically active element?

Answer: Fluorine

35. Most electronegative element of the periodic table?

Answer: Fluorine

36. The radioactive gaseous element?

Answer: Radon

37. The second hardest natural substance?

Answer: Corundum

38. The crystalline form of Aluminium oxide?

Answer: Corundum

39. The Largest Atom?

Answer: Francium

40. Lowest atomic volume?

Answer: Boron

41. Most abundant carbon compound in the nature?

Answer: Cellulose

42. Most stable radioactive Isotope?

Answer: Tellurium-130

43. Most toxic radioactive Isotope in air?

Answer: Thorium-238

44. Most toxic non-radioactive element in air?

Answer: Beryllium

45. Hardest substance in the world?

Answer: Diamond

46. White phosphorus is kept in?

Answer: Under water

47. The phosphorus used in the manufacture of match boxes?

Answer: Red phosphorus

48. Ore of Uranium?

Answer: Pitchblende

49. Heavy hydrogen is:

Answer: Deuterium

50. Gas used to fill electric bulb used for advertisement?

Answer: Neon

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