3. Iron filings can be separated from a heterogenous mixture using the technique of
Correct : B. Magnetization
4. The most abundant element by number in the living system is :
Correct : B. Hydrogen
5. Who discovered Potassium?
Correct : A. Humphry Davy
6. Air is -
Correct : C. Mixture
7. What is the formula of potassium ion in the noble gas state?
Correct : A. K⁺
8. The element absorbed both in cation and anion form is –
Correct : B. Nitrogen
9. Browning of paper in old books is caused by –
Correct : D. oxidation of cellulose
10. Which of the following is the hardest metal?
Correct : D. Tungstain
11. Nuclear sizes are expressed in a unit named -
Correct : A. Fermi
12. Which one of the following is responsible for the stimulating effect of tea?
Correct : C. Alkaloid
13. The contact process is involved in the manufacture of -
Correct : B. Sulphuric acid
14. Which of the following is the purest form of Carbon?
Correct : C. Diamond
15. Brass is made of –
Correct : C. copper and zinc
16. The wine is prepared by the process of -
Correct : A. fermentation
17. Compounds with identical molecular formula but different structures are called -
Correct : B. Structural isomers
18. PVC is formed by polymerization of -
Correct : D. Vinyl Chloride
19. The unit to measure the flow of water is
-
Correct : D. Cusecs
20. Which of the following metals occurs in free state?
Correct : D. Lead
21. Copper is refined by -
Correct : A. roasting
22. What is the common name of CaOCI2?
Correct : C. Bleaching Powder
23. Rutherford’s scattering experiment proved the presence of -
Correct : D. nucleusin atoms
24. When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in -
Correct : C. Emission spectra
25. Haemoglobin has the highest affinity with which of the following?
Correct : C. CO
26. Which of the following gases is produced due to incomplete combustion of fuel?
Correct : B. Carbon Monoxide
27. Acid used in an automobile battery?
Correct : A. Sulphuric acid
28. Which of the following is used as lubricant?
Correct : A. Graphite
29. Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–
Correct : C. dil. HCl and dil. HNO3
30. In deep-sea diving, divers use a mixture of gases consisting of oxygen and –
Correct : B. nitrogen
31. Nucleons are regarded as composites sub-particles known as –
Correct : B. Quarks
32. Which of the following is not a greenhouse gas?
Correct : B. O2
33. If Metal A displaces Metal B from its solution, then Metal A .
Correct : A. is more reactive than B
34. Who discovered electrons?
Correct : C. JJ Thomson
35. Which is also called Stranger Gas?
Correct : A. Xenon
36. Silicon is an example of -
Correct : C. A metalloid
37. The “King of Metals” is :
Correct : A. Gold
38. The strongest oxidizing agent among the following is:
Correct : C. Fluorine
39. A mixture of carbon monoxide and hydrogen is called -
Correct : B. Water gas
40. In Nuclear reactors graphite is used as
Correct : D. Modulator
41. Activated Charcoal is used to remove colouring matter from pure substances by –
Correct : C. Adsorption
42. Chernobyl disaster is the result of pollution by –
Correct : D. Radioactive waste
43. Which one of the following elements exists in liquid state at room temperature?
Correct : A. Mercury
44. Bone deformities occur due to excessive intake of:
Correct : D. Fluorine
45. The name of the scientist who discovered neutron is -
Correct : C. Chadwick
46. Of the following commonly used materials, the one that is not an alloy is -
Correct : D. Copper
47. Bronze is an alloy of –
Correct : A. Copper & tin
48. Which acid is used in Lead storage batteiy?
Correct : A. Sulphuric acid
49. Ethanoic acid is commonly called -
Correct : A. Acetic acid
50. The bubbles in Chanmpagne and Soda are -
Correct : D. Hydrogen
51. Which one is not metal?
Correct : D. all
52. What nucleus of atom contains?
Correct : D. protons and neutrons
53. Which of the following caused radioactive pollution along the coast of Kerala?
Correct : C. Thorium
54. For extinguishing fire, we use –
Correct : C. Carbon Dioxide
55. Which of the following metal has the lowest melting point?
Correct : C. Potassium
56. The main component of liquid bleach is:
Correct : B. Sodium hypochlorite
57. The chemical used as a fixer in photography is -
Correct : A. sodium thiosulphate
58. Which of the following is the most abundant metal on Earth's crust?
Correct : D. Aluminium
59. Which compound is formed when a Magnesium ribbon is burnt in air?
Correct : C. Magnesium Oxide
60. Nuclear fission is caused by the impact of.
Correct : C. Neutron
61. Interveinal necrotic spots on leaves appear due to –
Correct : B. SO2 injury
62. The pollutant responsible for ozone holes is -
Correct : D. CFC
63. Atomic themy of matter was given by –
Correct : B. Dalton
64. The major component in the LPG is -
Correct : B. butane
65. Which one of the following is not a 'green house gas'?
Correct : D. Nitrogen
66. Carbon dioxide is –
Correct : A. a reducing agent
67. An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is–
Correct : B. 19
68. The most reactive among the halogens is
Correct : A. Fluorine
69. Black lung disease occurs in people working in –
Correct : D. Coal mines
70. NaCI has .
Correct : D. Ionic bonds
71. The metal used to recover copper from a solution of copper sulfate is -
Correct : D. Fe
72. Which of the following is also known as 'Galena'?
Correct : C. Lead sulphide
73. Which of the following elements has the lowest melting point?
Correct : C. Radon
74. The oxidation number of nickel in K4[Ni(CN)4] is -
Correct : A. Zero
75. The rusting of iron is a/an -
Correct : B. electrochemical change
76. Ethanol containing 5% water is known as –
Correct : C. Rectified spirit
77. Stains of rust on clothes can be removed by –
Correct : A. Oxalic acid
78. If a solution turns blue litmus red, its pH is likely to be :
Correct : D. 6
79. An element with an atomic number of 17 is -
Correct : C. a halogen gas
80. Consider the following and select the right option.
Correct : C. Both are right
81. As which one of the following, does carbon occur in its purest form in nature?
Correct : C. Diamond
82. Which among the following is a covalent compound?
Correct : D. Carbon tetrachloride
83. The highest volume of gases in lower atmosphere is comprised of -
Correct : D. Nitrogen
84. The alkoloid naturally found in coffee, cocoa and cola nut is –
Correct : D. Caffeine
85. The metal used for making air crafts and rockets is –
Correct : C. Nickel
86. At what temperature is the density of water the maximum?
Correct : B. 4°C
87. Soil having high content of aluminum and iron oxide is also known as -
Correct : B. pedalfer soil
88. Chile saltpeter is the common name of:
Correct : A. Sodium nitrate
89. The gas liberated in the Bhopal gas tragedy was:
Correct : D. Methyl isocynate
90. Which of the following is not a gaseous air pollutant?
Correct : B. Hydrocarbon
91. At room temperature, the metal that remains liquid is:
Correct : A. Mercury
92. The chemical name or Quartz is –
Correct : D. Sodium silicate
93. The depletion in Ozone layer is caused by -
Correct : C. Chlorofluorocarbons
94. Which one of the following elements is essential for the construction of nuclear reactors?
Correct : C. Zirconium
95. The isotope atoms differ in -
Correct : A. number of neutrons
96. This substance is sweet-smelling and is used in making perfumes and flavouring agents. It is called-
Correct : D. Ester
97. An acid is a substance which
Correct : D. All
98. Two electrons in an orbital are differentiated by which of the following?
Correct : B. Spin quantum number
99. The most abundant element in the earth's atmosphere is –