Chemistry Ncert Level -02 - B- 50Q

Santhosh Kumar Athaluri Santhosh Kumar Athaluri
Dec 28, 2020 - 15:46
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1. What is "milk of magnesia" chemically?

(1) Magnesium carbonate
(2) Sodium bicarbonate
(3) Calcium hydroxide
(4) Magnesium hydroxide

2. The acid used in lead storage cells is –

(1) phosphoric acid
(2) hydrochloric acid
(3) nitric acid
(4) sulphuric acid

3. Milk tastes sour when kept in the open for sometime due to the formation of –

(1) lactic acid
(2) citric acid
(3) acetic acid
(4) carbonic acid

4. Which of the following is a natural dye?

(1) Crystal violet
(2) Aniline blue
(3) Alizarin
(4) Phenolphthalein

5. The ratio of pure gold in 18 carat gold is

(1) 60%
(2) 75%
(3) 80%
(4) 90%

6. What is the process in which acids and bases react to form salts and water.

(1) Neutralization
(2) Electrolysis
(3) Distillation
(4) Hydrolysis

7. The gas usually causing explosions in coal mines is –

(1) Hydrogen
(2) Carbon monoxide
(3) Air
(4) Methane

8. Which is the purest form of iron?

(1) Steel
2) Cast iron
(3) Pig iron
(4) Wrought iron

9. Which of the following metals form an amalgam with other metals?

(1) Lead
(2) Tin
(3) Zinc
(4) Mercury

10. Petroleum is a mixture of –

(1) elements
(2) hydrocarbons
(3) polymers
(4) salts

11. The gas used for filling weather balloons is –

(1) helium
(2) hydrogen
(3) air
(4) nitrogen

12. An emulsion is a colloid of a –

(1) gas in a liquid
(2) liquid in a liquid
(3) liquid in a gas
(4) gas in a solid

13. Percentage of carbon in steel ranges from –

(1) 0.1 to 1.5
(2) 1.5 to 3.0
(3) 3.0 to 4.0
(4) 4.0 to 6.0

14. Which of the following gases makes bread or cake rise making them soft and spongy?

(1) CO
(2) H2
(3) CO2
(4) O2

15. Candle is a mixture of –

(1) Paraffin wax and stearic acid
(2) Bees wax and stearic acid
(3) Higher fat acids and stearic acid
(4) Bees wax and paraffin wax

16. German silver, an alloy, does not contain the metal –

(1) Nickel
(2) Zinc
(3) Copper
(4) Silver

17. Oxygen which is vital for life is a product of photosynthesis and comes from –

(1) carbonates from soil
(2) carbon dioxide
(3) water
(4) oxides of mineral elements

18. What is the purpose of adding baking soda to dough?

(1) To generate moisture
(2) To give a good flavour
(3) To give good colour
(4) To generate carbon dioxide

19. Gobar gas mainly contains –

(1) Carbon dioxide
(2) Carbon monoxide
(3) Hydrogen sulphide
(4) Methane

20. The chief constituent of vinegar is –

(1) Formic acid
(2) Acetic acid
(3) Salycylic acid
(4) Oxalic acid

21. Commercial Vaseline is derived from -

(1) plant gums
(2) coal tar
(3) wool wax
(4) petroleum

22. Colour imparted to the Bunsen flame by strontium salt is -

(1) bluish green
(2) apple-green
(3) brick red
(4) crimson red

23. Name the particle that is most essential to continue the chain reaction during the fission of uranium -

(1) Electron
(2) Proton
(3) Neutron
(4) Positron

24. Which one amongst the following is not a Green House gas?

(1) Nitrogen
(2) Carbon dioxide
(3) Carbon Monoxide
(4) Chloro fluoro carbons

25. The element used in the manufacture of safety matches is –

(1) Phosphorous
(2) Magnesium
(3) Silicon
(4) Sulphur

26. The main source of Naphthalene is -

(1) Charcoal
(2) Camphor
(3) Coal-tar
(4) Diesel

27. The material used in solar cells contains

(1) Tin
(2) Silicon
(3) Caesium
(4) Thallium

28. Quartz is a crystalline form of -

(1) Alumina
(2) Glass
(3) Silica
(4) Limestone

29. In vulcanisation process, rubber can be hardened by adding -

(1) Nitrogen
(2) Silicon
(3) Sulphur
(4) Alcohol

30. Urea is a -

(1) Sodium fertilizer
(2) Phosphatic fertilizer
(3) Nitrogenous fertilizer
(4) Potassium fertilizer

31. During inter conversion of energy from one form to other forms, total energy at any time remains–

(1) constant
(2) zero
(3) increasing
(4) decreasing

32. Which of the following is a physical change?

(1) oxidation
(2) reduction
(3) sublimation
(4) decomposition

33. Sea weeds are important source of –

(1) iron
(2) chlorine
(3) bromine
(4) iodine

34. Which gas is used to manufacture vanaspati from vegetable oil is -

(1) carbon dioxide
(2) nitrogen
(3) oxygen
(4) hydrogen

35. The pH of a neutral solution is -

(1) 0-7
(2) 7
(3) 7-14
(4) None of the above

36. The nucleus of an atom consists of -

(1) electrons and neutrons
(2) electrons and protons
(3) protons and neutrons
(4) All of the above

37. Detergents are –

(1) Sodium salts of fatty acids
(2) Sodium salts of sulphonic acids
(3) Sodium salt of benzoic acid
(4) None of the above

38. The noble gas used in radiotherapy is

(1) neon
(2) argon
(3) radon
(4) xenon

39. Ethanol containing 5% water is known as –

(1) rectified spirit
(2) denatured spirit
(3) methylated alcohol
(4) power alcohol

40. The important ore of aluminium is –

(1) bauxite
(2) cryolite
(3) fluorspar
(4) haematite

41. Which of the following is not present in German-silver?

(1) Copper
(2) Nickel
(3) Silver
(4) Zinc

42. The major harmful gas emitted by automobile vehicles which causes air pollution is –

(1) Carbon Monoxide
(2) Methane
(3) Carbon dioxide
(4) Ozone gas

43. Who discovered the atom bomb?

(1) Madam Curie
(2) Pierre Curie
(3) Otto Hahn
(4) Albert Einstein

44. The major component of honey is -

(1) glucose
(2) sucrose
(3) maltose
(4) fructose

45. A body moving in a circular path with a constant speed has a -

(1) constant velocity
(2) constant acceleration
(3) constant kinetic energy
(4) constant displacement

46. What is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.

(1) Cellulose
(2) Glycogen
(3) Pectin
(4) Chitin

47. Potassium Permanganate is used for purifying drinking water, because

(1) it dissolves the impurities of water
(2) It is a sterilizing agent
(3) It is an oxidising agent
(4) It is a reducing agent

48. Diamond is harder than graphite because of –

(1) difference in layers of atoms
(2) tetrahedral structure of diamond
(3) difference of crystalline structures
(4) None of these

49. Gobar gas contains mainly –

(1) methane
(2) ethylene
(3) propylene
(4) acetylene

50. What is the most commonly used substance in fluorescent tubes?

(1) Sodium oxide and argon
(2) Sodium vapour and neon
(3) Mercury vapour and argon
(4) Mercury oxide and neon

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