Quiznetik

Chemistry | Set 7

1. J. B. Sumner isolated first enzyme from Jackbeans as-

Correct : C. urease

2. Highest percentage of carbon is found in which form of coal?

Correct : A. Anthracite

3. The chemical that is used to ripen mangoes is -

Correct : B. Calcium carbide

4. Which of the following is not a nitrogenous fetiliser?

Correct : D. Superphosphate

5. Bauxite is used as raw material by which industry?

Correct : A. Aluminium

6. Which of the following is not a natural source of hydrocarbon?

Correct : D. Mica

7. An acid having basicity one is -

Correct : B. Disodium hydrogen phosphate

8. Which one of the following vegetable oils is used in the manufacture of paints?

Correct : D. Cottonseed oil

9. Dry ice is the solid form of :

Correct : B. Carbon dioxide

10. The common name of sodium bicarbonate is -

Correct : B. Baking soda

11. Which element behaves chemically both as metal and nonmetal?

Correct : B. Boron

12. The amount of oxygen in the atmosphere remains relatively constant because it is given off by -

Correct : D. Plants

13. Which one of the following mineral does not contain oxygen?

Correct : C. Cryolite

14. Biogas majorly contains?

Correct : B. Methane

15. The scientific name for common salt is-

Correct : B. Sodium chloride

16. Which of the following is a noble gas -

Correct : A. Argon

17. Permanent - hardness of water may be removed by addition of –

Correct : B. Sodium carbonate

18. Which of the following is the best fuel in terms of energy released per gram of fuel?

Correct : A. Hydrogen

19. One carat of diamond is equal to -

Correct : C. 200mg

20. The manufacture of iron from iron ore involves the process of –

Correct : B. reduction

21. Which of the following is caused by the higher concentration of Nitrogen and Phosphorous?

Correct : A. Eutrophication

22. The smallest particle of an element is called -

Correct : C. Atom

23. There are some substances whose odor changes in acidic or basic media. These are called -

Correct : A. Olfactory indicators

24. Which of the following elements has the atomic number greater than that of Phosphorus?

Correct : C. Chlorine

25. If the sewage is fully oxidized, the nitrogen is in the form of –

Correct : D. Nitrates

26. Which among the following is used to dilute oxygen in the gas cylinders used by divers?

Correct : C. Helium

27. Which one of the following does not form oxyacid?

Correct : D. Fluorine

28. The gas used to extinguish fire is –

Correct : C. Carbon dioxide

29. is not an allotrope of carbon.

Correct : B. Carbon Doxide

30. Which hydrocarbons are the major constituents of 'LPG'?

Correct : B. Propane and Butane

31. When cathode rays strike a target of high atomic weight, they give rise to –

Correct : C. X-rays

32. The major use of sulphur is in the manufacture of –

Correct : A. H2SO4

33. Which of the following will replace hydrogen from acids to form salts?

Correct : B. Na

34. Which of the following metals has least, melting point?

Correct : C. Mercury

35. Water gas is the combination of –

Correct : A. CO and H2

36. which is stable com- pound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.ammonium phosphate.

Correct : C. (NH4)3PO4

37. If there is one million Mg2+ ions in MgCl2, how many chloride ions are there?

Correct : A. Two million

38. The gas that causes suffocation and death when coal or coke is burnt in a closed room is -

Correct : C. Carbon monoxide

39. Teryleneisa condensation polymer of ethylene glycol and which acid?

Correct : D. Terephthalic acid

40. Which of the following ores does not contain iron?

Correct : D. Cassiterite

41. Acids generate:

Correct : C. Both are correct

42. Which one of the following is not a characteristic feature of alloys? They are –

Correct : D. Homogeneous systems

43. When iron rusts, its weight –

Correct : B. increases

44. Nylon threads are made of -

Correct : B. Polyamide polymer

45. The manufacturing of iron from ironore involves the process of -

Correct : B. Reduction

46. Which one of the following elements is metalloid?

Correct : C. Ge

47. Cobalt (60) isotope is used in the treatment of which disease?

Correct : B. cancer

48. Which one of the following is used in the preparation of antiseptic solution?

Correct : B. Iodine

49. The characteristic odour of garlic is due to -

Correct : B. a sulphur compound

50. An emulsion is a colloidal solution of -

Correct : A. Liquid in liquid

51. is a by product of sewage treatment and can be decomposed to produce biogas.

Correct : B. Sludge

52. Silver gets corroded due to               in air.

Correct : B. Hydrogen Sulphide

53. Which of the following is a radioactive element?

Correct : B. Uranium

54. Whatis Zeolite?

Correct : A. Hydrated Aluminosilicate

55. L.P.G. is mostly liquefied

Correct : C. butane

56. Which have the maximum density?

Correct : A. Water

57. Which of the following metals is stored in kerosene oil?

Correct : C. Sodium

58. Atoms having the same number of protons but different number of neutrons are called :

Correct : A. Isotopes

59. Which one of the following elements is least likely to be found in commercial fertilisers?

Correct : D. Silicon

60. Organic compounds are -

Correct : A. Covalent compounds

61. Which of the following is NOT a renewable source of energy?

Correct : C. Energy from fossils

62. Compounds of carbon having double or triple bonds between their carbon atoms are called

Correct : B. Unsaturated compounds

63. An alloy used in making heating elements for electric heating device is -

Correct : C. Nichrome

64. The degree of dissociation of an electrolyte depends on -

Correct : A. dilution

65. Which of the following is present in Nail polish remover?

Correct : B. Acetone

66. Glass is mainly composed of -

Correct : A. Sodium silicate

67. Which of the following is essential for the synthesis of thyroxin?

Correct : D. Iodine

68. Chlorophyll is porphyrin containing -

Correct : A. magnesium

69. Which of the following processes is used for the production of Biodiesel?

Correct : C. Transesterification

70. A matured mammalian cell without nucleus is –

Correct : B. Erythrocyte

71. The most common cause of pollution of air is –

Correct : C. Sulphur dioxide

72. The main source of carbon monoxide is

Correct : C. Transportation

73. Tooth enamel is the hardest substance found in the human body. What is it made up of -

Correct : C. Calcium phosphate

74. A solution turns blue litmus red, its pH is likely to be -

Correct : C. 5

75. Which of the following metals is used in Space Crafts to withstand high temperatures?

Correct : B. Ti

76. Brass gets discoloured in air due to constant exposure in presence of:

Correct : B. Hydrogen sulphide

77. Neutrons are slowed down in a nuclear reactor by –

Correct : B. Moderator

78. An element of atomic no. 29 belongs to

Correct : B. d-block

79. Mechanical energy is the combination of kinetic energy and               .

Correct : C. Potential energy

80. Magnetism at the centre of a bar magnet is -

Correct : C. zero

81. Substances that cause a reaction to occur or proceed at a different rate without the reaction itself being affected are called -

Correct : A. Catalysts

82. Which one of the following elements exhibits the greatest tendency to lose electrons?

Correct : B. Lithium

83. Poison used for killing rats is –

Correct : B. Zinc phosphide (Zn3P2)

84. The commonly used safety fuse-wire is made of -

Correct : B. an alloy of Tin and Lead

85. Lead pencil contains -

Correct : B. Graphite

86. The most suitable unit for expressing nuclear radius is -

Correct : B. fermi

87. The catalyst used in hydrogenation of oils is -

Correct : C. Ni

88. What is used in storage batteries?

Correct : C. Lead

89. The biogas used for cooking is a mixture of which of the following?

Correct : D. Methane and carbon dioxide

90. Ozone saves the biosphere by absorbing high energy radiations called -

Correct : C. Ultraviolet rays (UV)

91. Silica gel is a -

Correct : C. drying agent

92. Neutron was discovered by -

Correct : A. Chadwick

93. Iodine can be separated from a mixture of Iodine and Potassium Chloride by -

Correct : B. Sublimation

94. Which of the following produces H2 gas, when reacts with acid?

Correct : A. Zn

95. Which one of the following is commonly used for pulp bleaching in the paper industry?

Correct : C. Hydrogen peroxide

96. Biofertilizers convert nitrogen to

Correct : B. ammonia

97. Radioactivity was discovered by

Correct : C. H.Becquerel

98. Which one of the following can be oxidized to the corresponding carbonyl compound -

Correct : D. 2-hydroxy propane

99. gives hardness to stainless steel.

Correct : C. Carbon

100. Which of the following is not soluble in water?

Correct : B. Zinc sulphate