Quiznetik

Chemistry | Set 10

1. lodex, a pain relief balm, has the smell of               .

Correct : A. Methyl salicylate

2. A complex compound in which the oxidation number of a metal is zero is -

Correct : C. [Ni (CO)4]

3. What is a Bakelite?

Correct : D. Polymer

4. What do you understand by the term Espuma?

Correct : A. Foam

5. The element used for vulcanizing rubber is -

Correct : A. Sulphur

6. Heavy metals got their name because compared to other atoms they have -

Correct : B. Higher atomic masses

7. Concentration of a material which is lethal to 50% animal is called–

Correct : A. LD50

8. Muddy water is treated with alum in purification process, it is termed as :

Correct : D. coagulation

9. ‘Plaster of paris’ chemically known as

Correct : B. Calcium sulphate

10. Which mineral is the ore of aluminium?

Correct : B. Bauxite

11. Which gas is used for converting vegetable oils into saturated fats?

Correct : A. H2

12. An electric iron has a heating element made of –

Correct : C. Nichrome

13. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called –

Correct : D. Galvanization

14. Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?

Correct : A. Carbon dioxide

15. Philosopher’s wool is chemically -

Correct : C. Zinc oxide

16. Charcoal is used in water treatment as a/an -

Correct : D. adsorbent

17. The chemical used for cloud seeding for artificial rains is -

Correct : C. Silver Iodide

18. Which among the following is liquid non-metal?

Correct : B. Bromine

19. The percentage of oxygen in air is approximately –

Correct : D. 21%

20. What is the second largest cornponent in milk?

Correct : A. Fat

21. Which of the following is NOT a primary green house gas in the earth's atmosphere?

Correct : D. Hydrogen

22. The presence of Cobalt in Vitamin B12 was established for the first time by –

Correct : B. Spectroscopy

23. Coating of solid waste with impervious material is known as –

Correct : A. Encapsulation

24. Sweat contains water and             .

Correct : C. Salt

25. How many bones are there in a newly born infant?

Correct : D. 300

26. White phosphorus is generally kept under –

Correct : B. Water

27. Which of the following acts as a resistance against disease in the body?

Correct : D. White corpuscles

28. Which one of the following is the softest

Correct : A. sodium

29. Brass contains –

Correct : A. Copper and Zinc

30. Which is the purest commercial form of iron?

Correct : D. Wrought iron

31. Which of the following particles has the dual nature of particle-wave?

Correct : A. Electron

32. Ultra purification of a metal is done by

Correct : B. zone melting

33. An antiknock for petrol is -

Correct : D. lead tetraethyl

34. The ratio of Pure gold and 18 carot gold is –

Correct : B. 75%

35. Limestone is a raw material used by which industry?

Correct : C. Cement

36. Atomic number of an atom gives the number of which of the following?

Correct : B. protons

37. Which one of the following metals does not react with water to produce Hydrogen?

Correct : A. Cadmium

38. Which of the following is not an ore of magnesium?

Correct : C. Calamine

39. Which of the following is usually not an air-pollutant?

Correct : D. Nitrous oxide

40. Which of the following fuels causes minimum environmental pollution?

Correct : C. Hydrogen

41. The compound used in prickly-heat powder to prevent excessive sweating is –

Correct : A. Boric acid

42. The colour of Emerald is -

Correct : C. Deep Green

43. The oxygen liberated during Photosynthes is comes from -

Correct : A. Water

44. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of

Correct : B. Zeolites

45. Adding which substance gives blue colour to glass?

Correct : B. Cobalt oxide

46. The antiparticle of an electron is –

Correct : A. Positron

47. Vinegar is           .

Correct : A. diluted acetic acid

48. What is the product formed when sodium bicarbonate is heated strongly?

Correct : A. Sodium Carbonate

49. The most electronegative element among the following is -

Correct : C. fluorine

50. Atomic size refers to the               of an atom.

Correct : A. Radius

51. Which is the highest quality of hard coal?

Correct : A. Anthracite

52. Which of the following is not a commercial source of energy?

Correct : D. Firewood

53. Which one of the following substances does not have a melting point?

Correct : C. Mercury

54. Which one of the following metals occurs in nature in free state?

Correct : A. Gold

55. The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –

Correct : B. Cesium

56. Catalytic converters are generally made from

Correct : C. Transition metals

57. In galvanization, iron is coated with –

Correct : B. Zinc

58. Which one of the folling is also khow as solution?

Correct : B. Ahomogeneous mixture

59. Which of the following is very reactive and kept in kerosene?

Correct : A. Sodium

60. Which one of the following is known as the ‘brown coal’?

Correct : D. Lignite

61. The chief source of naphthalene is -

Correct : A. Coal-tar

62. This substance is commonly known as alcohol and is also used in medicines such as tincture iodine, cough syrups, and many tonics. This is -

Correct : C. Ethanol

63. Enzymes are -

Correct : C. Proteins

64. Sulphuric acid is –

Correct : B. dibasic

65. Which of the following metals can deposit copper from copper sulphate solution?

Correct : C. Iron

66. When Arsenic atoms are added Germanium lattice, it becomes a/an -

Correct : D. Extrinsic semiconductor

67. Hydrogen bomb is based upon the principle of             .

Correct : B. Nuclear fusion

68. In an acid base reaction which product is produced along with a salt?

Correct : D. Water

69. The element present in the largest amount in rocks and minerals is -

Correct : B. silicon

70. Washing soda is -

Correct : C. sodiun carbonate

71. An element that does not occur in nature but can be produced artificially is –

Correct : C. plutonium

72. Chloroform can be used as –

Correct : B. Anaesthetic

73. Gas released during Bhopal tragedy was –

Correct : D. Methyl isothiocyanate

74. When water itself combines chemically with some element or mineral it is called –

Correct : C. Hydration

75. The electronic configuration of an atom having atomic number `20' is –

Correct : C. 2, 8, 8, 2

76. Which chemical is used to ripen mangoes artificially?

Correct : C. Calcium Carbide

77. 'Monazite' is an ore of -

Correct : C. Thorium

78. The luster of a metal is due to -

Correct : D. presence of free electrons

79. The depletion of Ozone layer is mainly due to –

Correct : D. Chlorofluorocarbons

80. Glass is soluble in -

Correct : D. HF

81. Acid rain is caused by -

Correct : D. (4) SO2 and NO2

82. What happens in a reduction reaction?

Correct : C. addition of Hydrogen

83. The energy released at the end of digestion is in the form of:

Correct : D. chemical energy

84. The fuel in atomic pile is -

Correct : D. uranium

85. The gas used for artificial ripening of green fruit is -

Correct : B. Ethylene

86. A mixture of water and alcohol can be separated by –

Correct : D. Distillation

87. The inert gas abundantly found in widely distributed is -

Correct : D. Ar

88. Brine refers to :

Correct : A. Salt water

89. The Bhopal tragedy was caused by the gas -

Correct : C. methyl isocyanate

90. Which one of the following contributes largely to the ‘green house effect’?

Correct : D. Water vapour

91. The gas that usually causes explosions in coal mines is -

Correct : D. Methane

92. The chemical name for common salt -

Correct : A. Sodium chloride

93. The I.C Chip used in a computer is made up of -

Correct : A. Silicon

94. The chemical name of "Plaster of Paris" commonly used for setting broken bones is –

Correct : B. Calcium sulphate

95. Which of the following is NOT malleable?

Correct : A. Graphite

96. The element found in the surface of the Moon is –

Correct : D. Titanium

97. Which of the following is not a chemical reaction'?

Correct : C. Conversion of water into steam

98. Which of the following is used as anesthetic?

Correct : B. NO

99. Gypsum is used for improvement of:

Correct : B. Saline soils

100. Spontaneous change is one in there is:

Correct : B. A lowering of free energy