1. Identify the metal which is Non-toxic in nature–
(A) Gold
(B) Cadmium
(C) Cobalt
(D) Chromium
Ans. (A)
2. Main constituent of liquid bleach is –
(A) Hydrochloric acid
(B) Sodium chloride
(C) Sodium hypochlorate
(D) Sodium hypochlorite
Ans. (D)
3. Caustic Soda is –
(A) Deliquescent
(B) Oxidant
(C) Reductant
(D) Efflorescent
Ans. (A)
4. Which of the following is used in welding broken pieces of iron rails and parts of machine–
(A) Aluminium sulphate
(B) Solder
(C) Aluminium powder
(D) None of these
Ans. (C)
5. Hydrogen sulphide is a–
(A) Colourless, odourless gas
(B) Yellowish gas with pungent odour
(C) Reddish brown gas with fishy odour
(D) Colourless gas with rotten egg smell
Ans. (D)
6. Tip of match stick contains –
(A) Phosphorous penta oxide
(B) White phosphorous
(C) Red phosphorous
(D) Phosphorous trichloride
Ans. (C)
7. Match Stick uses the allotrope of Phosphorous–
(A) Any Phosphorous
(B) Red phosphorous
(C) Black Phosphorous
(D) Purple Phosphorous
Ans. (B)
8. Most abundant inert gas in the atmosphere is
(A) He
(B) Ne
(C) Kr
(D) Ar
Ans. (D)
9. Green colour seen in firework display, is due
to the chloride salt of–
(A) Sodium
(B) Calcium
(C) Barium
(D) Strontium
Ans. (C)
10. Which of the following will displace Hydrogen from acids to form salts?
(A) S
(B) Na
(C) Ag
(D) P
Ans. (B)
11. Liquid Chemical used for artificial rain or cloud seeding–
(A) Silver iodide (AgI)
(B) Sodium chloride (NaCl)
(C) Dry ice (solid CO2)
(D) All the these
Ans. (D)
12. The inert gas used as beacon Light is –
(A) Krypton
(B) Argon
(C) Helium
(D) Neon
Ans. (D
13. Hydrogen was discovered by –
(A) Boyle
(B) Charles
(C) Cavendish
(D) Priestley
Ans. (C)
14. Gas used in the production of vegetable ghee is–
(A) Hydrogen
(B) Helium
(C) Oxygen
(D) Nitrogen
Ans. (A)
15. Ozone Contains–
(A) Only oxygen
(B) Oxygen and nitrogen
(C) Hydrogen and carbon
(D) Oxygen and carbon
Ans. (A)
16. Ozone is represented as _____.
(A) O3
(B) H2O2
(C) Cl2O
(D) N2O
Ans. (A)
17. A white solid ‘A’ gives off a gas which turns
lime water milky. The residue is yellow but
turns white on cooling. Now the solid is–
(A) Zinc sulphate
(B) Zinc carbonate
(C) Lead sulphate
(D) Lead carbonate
Ans. (B)
18. Which of the following can not be formed
(A) He+2
(B) He+
(C) He
(D) He2
Ans. (D)
19. Chemical name of bleaching powder is–
(A) Calcium chlorate
(B) Calcium hypochlorite
(C) Calcium chloro hypochlorite
(D) Calcium dichloride
Ans. (B)
20. Which one among the following is used
commonly in the dehydration of water?
(A) Bleaching powder
(B) Alum
(C) Borax
(D) Soda powder
Ans. (A)
21. Which one of the following is odd–
(A) Chalk
(B) Slaked lime
(C) Limestone
(D) Marble
Ans. (B)
22. Lime water becomes milky when exposed to air due to the presence of –
(A) Carbon dioxide
(B) Nitrogen
(C) Oxygen
(D) Sulphur dioxide
Ans. (A)
23. Which of the following gas is coloured?
(A) Oxygen
(B) Nitrogen
(C) Chlorine
(D) Hydrogen
Ans. (C)
24. Chemically Lime water is –
(A) Calcium Hydroxide
(B) Sodium Carbonate
(C) Sodium Hydroxide
(D) Calcium carbonate
Ans. (A
25. Which gas is used as a fire extinguisher?
(A) Carbon dioxide
(B) Carbon monoxide
(C) Carbon suboxide
(D) Sulphur dioxide
Ans. (A)
26. Mercury is a –
(A) Solid metal
(B) Liquid metal
(C) Solid nonmetal
(D) Liquid nonmetal
Ans. (B)
27. What is dry ice?
(A) Dry ice without water
(B) Benzoic acid
(C) Glacial acetic acid
(D) Solid carbon dioxide
Ans. (D)
28. Diamond does not conduct electricity, because
(A) It’s structure is very compact
(B) It is of crystalline nature
(C) There are only carbon atoms, present in it
(D) No free electrons are present in it
Ans. (D)
29. Charcoal is used in water treatment as a/an–
(A) Solvent
(B) Absorbent
(C) Coagulant
(D) Adsorbent
Ans. (D)
30. The gas which turns into Liquid at the Lowest
temperature among the following is–
(A) Hydrogen
(B) Oxygen
(C) Helium
(D) Nitrogen
Ans. (A)
31. Heavy water means–
(A) Water which is used in heavy industries.
(B) Distilled water
(C) Water containing Maximum density
(D) Water containing salts of calcium and Magnesium
Ans. (C)
32. What is the chemical composition of Heavy
Water?
(A) H2
O (B) HDO
(C) D2
O (D) H2O2
Ans. (C
33. Soda water contains –
(A) SO2
(B) NO2
(C) H2
(D) CO2
Ans.(D)
34. Which of the following is used for making smoke bombs?
(A) Sulphur
(B) Phosphorous
(C) Hydrogen
(D) Carbon
Ans. (B)
35. Hydrogen Peroxide is an effective Sterilizing agent. Which one of the following product isformed when it readily loses active oxygen?
(A) Water
(B) Hydrogen
(C) Ozone
(D) Nascent hydrogen
Ans. (A)
36. In deep see diving, divers use a mixture of gases consisting of oxygen and–
(A) Argon (Ar)
(B) Helium (He)
(C) Helium (He) and nitrogen (N)
(D) Hydrogen (H)
Ans. (C)
37. The Gas dissolved in water that makes it basic is?
(A) Hydrogen
(B) Carbon dioxide
(C) Sulphur dioxide
(D) Ammonia
Ans. (D)
38. Which metal is extracted from Sea water?
(A) Potassium
(B) Aluminium
(C) Magnesium
(D) Beryllium
Ans. (C)
39. Silicone is a Polymer of–
(A) Silicon Tetra Chloride
(B) Dialkyl dichloro silane
(C) Silane
(D) Tetra alkyl silane
Ans. (B)
40. Which one of the following gases mixed oxygen
in aqualungs used by divers for the breathing?
(A) Methane
(B) Nitrogen
(C) Helium
(D) Hydrogen
Ans. (C)
41. Which of the oxide is neutral?
(A) CO
B) SnO2
(C) ZnO
(D) SiO2
Ans. (A)
42. Which of the following oxide is amphoteric in character?
(A) CaO
(B) CO2
(C) SiO2
(D) SnO2
Ans. (D)
43. Which one of the following is a biochemical sediment rock?
(A) Marble
(B) Coal
(C) Granite
(D) Slate
Ans. (B)
44. Which one of the following element is an
Example of noble gas?
(A) Nitrogen
(B) Hydrogen
(C) Chlorine
(D) Helium
Ans. (D)
45. Which one of the following is not a form of carbon?
(A) Graphite
(B) Charcoal
(C) Soot
(D) Haematite
Ans. (D)
46. Percentage of Lead in Lead Pencils is –
(A) 0
(B) 31-66
(C) 40
(D) 80
Ans. (A)
47. The material used in the manufacture of Lead pencil is–
(A) Graphite
(B) Lead
(C) Carbon
(D) Mica
Ans. (A)
48. P laster of Paris is made by the Partial dehydration of–
(A) Green vitriol
(B) Blue vitriol
(C) Gypsum salt
(D) Epsom salt
Ans. (C)
49. Which among the following halogens is the most reactive?
(A) Fluorine
(B) Bromine
(C) Iodine
(D) Chlorine
Ans. (A)
50. Non-metal found in Liquid State–
(A) Bromine
(B) Nitrogen
(C) Fluorine
(D) Chlorine
Ans. (A
51. Which silver salt is used for making film of photography?
(A) Silver bromide
(B) Silver chloride
(C) Silver sulphate
(D) Silver nitrate
Ans. (A)
52. The chemical name of Hypo commonly used in
Photography is–
(A) Sodium thiosulphate
(B) Sodium nitrate
(C) Sodium chloride
(D) Silver nitrate
Ans. (A)
53. Silver halides are used in photographic plate
because they are–
(A) Oxidised in air
(B) Soluble in Hyposolution
(C) Reduced by Light
(D) Totally coloureless
Ans. (C)
54. Chemically ‘Philosopher Wool’ is a–
(A) Zinc oxide
(B) Calcium oxide
(C) Aluminium oxide
(D) Magnesium
Ans. (A)
55. Oxygen is a–
(A) Reducing agent
(B) Combustion nourishing
(C) Constituent of all gas
(D) Inflammable gas
Ans. (B)
56. Carbon monoxide is an inflammable gas which
one of the following is also inflammable?
(A) Helium
(B) Nitrogen
(C) Oxygen
(D) Hydrogen
Ans. (D)
57. Select the incorrect statement regarding the
carbon compounds –
(A) They have low melting and boiling Point
(B) Insoluble in water
(C) These are not easily combustible
(D) They mainly contain carbon and Hydrogen.
Ans. (C)
58. Chemical Name of common salt is–
(A) Sodium chloride
(B) Sodium nitrate
(C) Ammonium chloride
(D) Calcium chloride
Ans. (A)
59. Sodium chloride or Table salt occurs in nature
as the mineral:
(A) Sylvite
(B) Talc
(C) Halite
(D) Sphalerite
Ans. (C)
60. Sodium carbonate commonly known as–
(A) Baking soda
(B) Washing soda
(C) Caustic soda
(D) Caustic potash
Ans. (B)
61. Chemical formula of washing soda is–
(A) Na2SO4.10H2O
(B) NaHCO3
(C) Na2CO3.10H2O
(D) Ca(OH)2
Ans. (C)
62. The common name of sodium bicarbonate is _____.
(A) Baking soda
(B) Borax
(C) Bleach
(D) Epsom salt
Ans. (A)
63. Chemical name of baking soda is–
(A) Sodium carbonate
(B) Sodium bicarbonate
(C) Sodium chloride
(D) Sodium nitrate
Ans. (B)
64. What is baking soda?
(A) Aluminium bicarbonat
B) Sodium isolate
(C) Sodium bicarbonate
(D) Aluminium sulphate
Ans. (C)
65. Mortar is a mixture of water, sand –
(A) Slaked lime
(B) Quick Lime
(C) Lime Stone
(D) Gypsum
Ans. (A
66. Most commonly bleaching agent is –
(A) Carbon dioxide
(B) Alcohol
(C) Chlorine
(D) Sodium Chloride
Ans. (C)
67. Helium gas is filled in the balloon instead of Hydrogen because its–
(A) Lighter than Hydrogen
(B) More abundant than Hydrogen
(C) Non-Combustible
(D) More stable
Ans. (C)
68. Why Helium gas used in balloons?
(A) Its atomic number is two
(B) Its Lighter than air
(C) It’s one of the constituents of water
(D) It’s a noble gas
Ans. (B)
69. A balloon filled with Helium rises in air because–
(A) Air exerts on upward force on the balloon.
(B) The balloon is weightless
(C) Helium is less dense than air
(D) Helium pushes down the air below the balloon.
Ans. (C)
70. Which gas is filled in balloons?
(A) Hydrogen
(B) Helium
(C) Carbon dioxide
(D) Oxygen
Ans. (B)
71. Which of the following Noble gas can forms compound?
(A) Helium
(B) Argon
(C) Xenon
(D) Krypton
Ans. (C)
72. The maximum density of water is at–
(A) 1000C
(B) 00C
(C) 40C
(D) 2730C
Ans. (C)
73. White Phosphorous is placed under the–
(A) Ammonia
(B) Cold water
(C) Alcohol
(D) Kerosene
Ans. (B
74. Commonly sodium is kept under the–
(A) Alcohol
(B) Water
(C) Ammonia
(D) Kerosene oil
Ans. (D)
75. Which of the following can be used as an anesthetic?
(A) NH3
(B) NO
(C) NO2
(D) N2O
Ans. (D)
76. Dry powder fire extinguisher contains –
(A) Sand
(B) Sand and sodium carbonate
(C) Sand and potassium carbonate
(D) Sand and sodium bicarbonate
Ans. (D
78. Noble gas used in the treatment of cancer is–
(A) Helium
(B) Argon
(C) Krypton
(D) Radon
Ans. (D)
79. Old oil painting becomes black due to the formation of–
(A) Cu2S
(B) PbS
(C) CaS
(D) Na2S
Ans. (B)
80. Which of the follow ing is second most abundant element on the
surface of sun beside Hydrogen?
(A) Helium
(B) Neon
(C) Argon
(D) Oxygen
Ans. (A)
81. What is Asbestos?
(A) Calcium magnesium silicate
(B) Alumina
(C) Calcium silicate
(D) Magnesium silicate
Ans. (A
82. At room temperature, the metal that remains
liquid is:
(A) Mercury
(B) Platinum
(C) Lead
(D) Zinc
Ans. (A)
83. If the bullets could not be removed from gunshot injury
of a man, it May cause poisoning by–
(A) Mercury
(B) Lead
(C) Iron
(D) Arsenic
Ans. (B)
84. The ratio of pure gold in 18 carat gold is –
(A) 100% (B) 80%
(C) 75% (D) 60%
Ans. (C
85. Purity of gold is expressed in terms of carat.
Purest form of gold is–
(A) 24 Carat
(B) 99.6 Carat
(C) 91.6 Carat
(D) 22 Carat
Ans. (A)
86. The King of metal is –
(A) Gold
(B) Silver
(C) Iron
(D) Aluminum
Ans. (A)
87. Standard 18 carat Gold sold in the Market is –
(A) 82 parts of gold and 18 parts of Metal
(B) 18 parts of gold and 82 parts other metal
(C) 18 parts gold and 6 parts other metal
(D) 9 parts gold and 15 parts other metal
Ans. (C)
88. Which one of the following is known as the
brown coal?
(A) Anthracite
(B) Bituminous
(C) Coke
(D) Lignite
Ans. (D)
89. Which one of the following is not a coal
variety?
(A) Bituminous
(B) Lignite
(C) Peat (D) Dolomite
Ans. (D)
90. Which of the following elements behave
chemically both as Metal and a Non-metal?
(A) Argon (B) Carbon
(C) Xenon (D) Boron
Ans. (D)
91. Which of the following metal has maximum electrical conductivity?
(A) Copper (B) Aluminium
(C) Silver (D) Lead
Ans. (C)
92. Illumination of Metal is caused by the –
(A) High density due to close packing of atoms
(B) Highly Polished
(C) Reflection of Light due to presence of free electrons
(D) Absorption of Light due to presence of sockets.
Ans. (C)
93. Heavy metals got their names because
compared to others atoms they have
(A) Higher atomic mass
(B) Higher atomic radii
(C) Higher densities
(D) Higher atomic number
Ans. (C)
94. Which of the following is the most bad conductor?
(A) Iron
(B) Lead
(C) Silver
(D) Gold
Ans. (B)
95. Which metal is protected by the layer of its own oxide?
(A) Silver
(B) Iron
(C) Aluminium
(D) Calcium
Ans. (C)
96. The ore of only two metals that are Non–Silver
in colour, they are–
(A) Nickel and zinc
(B) Copper and gold
(C) Palladium and platinum
(D) Sodium and magnesium
Ans. (B)
97. The Soft Silvery Metallic element which ionizes easily when heated or exposed to Light and it present in atomic clocks is–
(A) Californium
(B) Cesium
(C) Calcium
(D) Cerium
Ans. (B)
98. Which one of the following metals cannot be
used as an electromagnet?
(A) Iron
(B) Copper
(C) Nickel
(D) Cobalt
Ans. (B)
99. Quartz is a type of –
(A) Silicon dioxide
(B) Sodium silicate
(C) Aluminium oxide
(D) Magnesium carbonate
Ans. (A)
100. Which one of the following is used in Pencils?
(A) Charcoal
(B) Graphite
(C) Sulphur
(D) Phosphorus
Ans. (B)
101. In Graphite layers are held together by–
(A) Vander waal forces
(B) Metallic bond
(C) Ionic bond
(D) Covalent bond
Ans. (A)
102. Which one among the following is Lubricant?
(A) Germanium
(B) Sulphur
(C) Graphite
(D) Indium
Ans. (C)
103. Diamond is harder than Graphite because of–
(A) Difference of layers of atom
(B) Tetrahedral structure of diamond
(C) Difference of crystalline structure
(D) None of these
Ans. (C)
104. One carat of Diamond is equal to –
(A) 100 mg
(B) 150 mg
(C) 200 mg
(D) 250 mg
Ans. (C)
105. Which of the following property is generally found in non metals?
(A) Brittleness
(B) Conductivity
(C) Ductility
(D) Malleability
Ans. (A
106. Fire-Fighting clothes are made from–
(A) Mica
(B) Asbestos
(C) Talc
(D) Steatite
Ans. (B)
107. Fullerene is a newly discovered crystalline
carbon allotrope, contains–
(A) 100 C atoms
(B) 80 C atoms
(C) 60 C atoms
(D) 40 C atoms
Ans. (C)
108. Chile saltpeter is the common name of–
(A) Potassium Nitrate
(B) Sodium Nitrate
(C) Sodium Nitrite
(D) Potassium Nitrite
Ans. (B
109. Which among the following elements is a liquid at room temperature?
(A) Phosphorus
(B) Mercury
(C) Sodium
(D) Aluminium
Ans. (B)
110. Wh ich among the fo llowing is white phosphorus?
(A) P1 (B) P6
(C) P4 (D) P5
Ans. (C)
111. Alkali metals can
(A) Be highly unstable at room temperature
(B) Vaporize at room temperature
(C) Easily gain electrons
(D) Easily lose electrons
Ans. (D)
112. Which among the following has the maximumdensity?
(A) Water
(B) Ice
(C) Ethylene
(D) Acetone
Ans. (A)
113. Who discovered Nitrogen?
(A) Faraday
(B) Heisenberg
(C) Hooke
(D) Rutherford
Ans. (D)
114. Which of the following gases is present in the atmosphere can be detected by its odour ?
(A) Ethane
(B) Sulphur dioxide
(C) Hydrogen
(D) Carbon monoxide
Ans. (B)
115. If water smells bad, then that odour can be removed by adding
(A) Alum
(B) Bleach
(C) Activated carbon
(D) Deactivated nitrogen
Ans. (C)
116. Which of these is not a macronutrient for Plants?
(A) Nitrogen
(B) Phosphorous
(C) Potassium
(D) Chlorine
Ans. (D)
117. Which of the following elements has the lowest melting point?
(A) Platinum
(B) Carbon
(C) Cobalt
(D) Krypton
Ans. (D)
118. Why metals conduct electricity ?
(A) Because of low melting point
(B) Because of high tensile strength
(C) Because of free electrons
(D) Because of high atomic density
Ans. (C)
119. Density of water is maximum at ______.
(A) 12 degree celsius
(B) 8 degree celsius
(C) 4 degree celsius
(D) 0 degree celsius
Ans. (C)
120. Which of the following elements has the lowest melting point?
(A) Bromine
(B) Zinc
(C) Lead
(D) Calcium
Ans. (A)
121. Heavy water is_____.
(A) Monoterium oxide
(B) Polyterium oxide
(C) Deuterium oxide
(D) Trislum oxide
Ans. (C)
123. Who discovered Oxygen?
(A) Carl Scheele
(B) Hooke
(C) Heisenberg
(D) Williams
Ans. (A) (
125. Which of the following statement is false?
(A) Radon is obtained from the decay of radium.
(B) Helium is an inert gas
(C) Xenon is the most reactive among the rare gases
(D) The most abundant rare gas found in the atmosphere is Radon.
Ans. (D)
126. The Chemical formula of Cadmium nitrate is _____.
(A) Cd(NO3)
2 (B) CdNO3
(C) Cd2(NO4C)2
(D) Cd2NO3
Ans. (A)
127. The common name of hydrogen peroxide is
(A) Borax
(B) Bleach (liquid)
(C) Baking soda
(D) Gypsum
Ans. (B)
128. Which of the following elements has the lowest melting point?
(A) Sodium
(B) Tin
(C) Radon
(D) Radium
Ans. (C)
129. Barium loses ____ electrons to achieve noble gas electron configuration.
(A) 1
(B) 2
(C) 3
(D) 4
Ans. (B)
130. The common name of sodium tetraborate decahydrate is _____.
(A) Epsom salt
(B) Gypsum
(C) Borax
(D) Galena
Ans. (C)
131. The Chemica l formu la of Ammonium dichromate is _____.
(A) (NH4) 2Cr2O7
(B) (NH4)CrO3
(C) (NH4)Cr2O3
(D) (NH4) 2Cr2O3
Ans. (A)
132. Which gas among the following used as an anaesthetic?
(A) Methane
(B) Carbon dioxide
(C) Nitrous oxide
(D) Nitrogen
Ans. (C)
133. Which of the following elements has the lowest melting point?
(A) Titanium
(B) Tungsten
(C) Argon
(D) Nickel
Ans. (C)
134. The common name of sulphur is
(A) Freon
(B) Galena
(C) Lime
(D) Brimstone
Ans. (D)
135. The Chemical formula of Aluminium Chloride is _____.
(A) AlCl
(B) AlCl2
(C) AlCl3
(D) Al2Cl3
Ans. (C)
136. The Chemical formula of Ammonium Oxalate
is _____.
(A) (NH4) 2C2O4
(B) (NHD)2CO4
(C) (NHD)2C2O4
(D) (NHD)2C2O3
Ans. (A)
137. Chemical Formula of Water is _____ .
(A) O2
(B) N2O
(C) NaOH
(D) H2O
Ans. (D)
138. The Chemical formula of Ammonium sulphate is
(A) NH4SO4
(B) (NH4) 2SO3
(C) NH4SO3
(D) (NH4) 2SO4
Ans. (D)
139. Which of the following elements has the lowest
melting point?
(A) Platinum
(B) Sodium
(C) Antimony
(D) Krypton
Ans. (D)
140. The common name of Magnesium Sulphate heptahydrate is
(A) Epsom salt
(B) Borax
(C) Gypsum
(D) Lime
Ans. (A)
141. Which of the following elements has the lowest melting point?
(A) Helium
(B) Potassium
(C) Tungsten
(D) Sulphur
Ans. (A)
142. The chemical formula of Ammonia is _____ .
(A) NH4+
(B) NH
(C) NH2
(D) NH3
Ans. (D)
143. Who discovered Fullerene (an allotrope of carbon)?
(A) K Scheele
(B) Richard Smalley
(C) Faraday
(D) Heisenberg
Ans. (B) (
144. Which of the following is not a Halon gas ?
(A) Methane
(B) Carbon tetra chloride
(C) Iodomethane
(D) Bromomethane
Ans. (A)
145. Which of the following elements has the lowest melting point?
(A) Tin
(B) Hydrogen
(C) Carbon
(D) Sodium
Ans. (B)
146. The Chemical formula of Ammonium chloride is ___________.
(A) (NH(D)2Cl
(B) NH4Cl3
(C) NH4Cl2
(D) NH4Cl
Ans. (D)
147. Which of the following elements has the lowest melting point?
(A) Iron
(B) Nitrogen
(C) Iodine
(D) Lead
Ans.(B)
148. Filament of electric bulb is made of _____.
(A) Magnesium
(B) Lead
(C) Tin
(D) Tungsten
Ans. (D)
149. Chemical formula of Ammonia is _______.
(A) PH3
(B) NO2
(C) AlN
(D) NH3
Ans. (D)
150. Which of the following elements has the lowest melting point?
(A) Oxygen
(B) Platinum
(C) Sodium
(D) Tin
Ans. (A)
151. Chemical Formula of Aluminium Nitride is
(A) AN
(B) AlN
(C) AlNi
(D) ANi
Ans. (B)
152. NaHCO3 is chemical formula for ___________.
(A) Borax
(B) Vinegar
(C) Lime
(D) Baking soda
Ans. (D)
153. Which of the following elements has the lowest melting point?
(A) Chromium (B) Hydrogen
(C) Zinc
(D) Silver
Ans. (B)
154. Which of the following elements has the lowest melting point?
(A) Boron
(B) Calcium
(C) Neon
(D) Gold
Ans. (C)
155. The Chemical formula of Ammonium nitrate is ___________.
(A) (NHB)2NO3
(B) NH4NO3
(C) NH4(NOC)2
(D) NH2NO3
Ans. (B)
156. Which of the following elements has the lowest melting point?
(A) Xenon
(B) Iodine
(C) Barium
(D) Magnesium
Ans. (A)
157. Which of the following elements has the lowest melting point?
(A) Titanium
(B) Sulphur
(C) Argon
(D) Zinc
Ans. (C)
158. Which of the following elements has the lowest melting point?
(A) Oxygen
(B) Gold
(C) Silver
(D) Manganese
Ans. (A)
159. What is washing soda?
(A) Aluminium bicarbonate
(B) Sodium bicarbonate
(C) Aluminium sulphate
(D) Sodium carbonate
Ans. (D)
160. Which of the following elements has the lowest
melting point?
(A) Zinc
(B) Titanium
(C) Sulphur
(D) Fluorine
Ans. (D)
161. Which of the following is false?
(A) Hydrogen atom is roughly a third of the mass of tritium
(B) Deuterium is called heavy hydrogen
(C) Deuterium atom has 1 neutron
(D) Protium is the rarest isotope of hydrogen
Ans. (D)
162. Zeolite is
(A) Hydrated ferric oxide
(B) Hydrated sodium aluminium silicate
(C) Sodium hexametaphosphate
(D) Sodium tetraborate
Ans. (B)
163. Helium is added to the oxygen supply of dee sea divers because it is_______
(A) Less poisonous than nitrogen
(B) Lighter than nitrogen
(C) Readily miscible with oxygen
(D) Less soluble in blood than nitrogen at high pressure
Ans. (D)
164. Water is used in a hot water bag because
(A) It is easily available
(B) It has high specific gravity
(C) It has high specific heat
(D) It is a liquid substance
Ans. (C)
165. What is contained in Chlorophyll ?
(A) Sodium
(B) Potassium
(C) Manganese
(D) Magnesium
Ans. (D)
166. What is the product formed when sodium bicarbonate is heated strongly?
(A) Sodium carbonate
(B) Sodium hydroxide
(C) Sodium peroxide
(D) Sodium monoxide
Ans. (A)
167. The most pure form of carbon among the options is
(A) Anthracite
(B) Lampblack
(C) Graphite
(D) Wood Charcoal
Ans. (C)
168. Activated Charcoal is used to remove colouring
matter from pure substances by ____.
(A) Bleaching
(B) Oxidation
(C) Adsorption
(D) Reduction
Ans. (C)
169. Silica gel is a
(A) Moisturizer
(B) Flavouring agent
(C) Drying agent
(D) Delicious food
Ans. (C)
170. Silver gets corroded due to _______ in air.
(A) Oxygen
(B) Hydrogen sulphide
(C) Carbon dioxide
(D) Nitrogen
Ans. (B)
171. Which of the metals has the maximum thermal conductivity?
(A) Iron
(B) Aluminium
(C) Silver
(D) Copper
Ans. (C)
172. Which one of the following forms of phosphorous is most reactive?
(A) Black Phosphorous
(B) White Phosphorous
(C) Voilet Phosphorous
(D) Red Phosphorous
Ans. (B)
173. Magnesium is a constituent metal of ______________.
(A) Chlorophyll molecule
(B) DNA
(C) Mitochondria
(D) Ribosomes
Ans. (A)
174. Name the gas used in preparation of bleaching powder
(A) Oxygen (B) Hydrogen
(C) Nitrogen (D) Chlorine
Ans. (D)
175. Phosphorous is kept in water because
(A) Its ignition temperature is very high
(B) Its ignition temperature is very low
(C) Its critical temperature is high
(D) Its critical temperature is low
Ans. (B)
176. In arc welding Argon is used because of its
(A) Low reactivity with metal
(B) Ability to lower the melting point of the metal
(C) High flammability
(D) High calorific value
Ans. (A)
177. Inert gases are
(A) Miscible with water
(B) Not stable
(C) Chemically unreactive
(D) Chemically very active
Ans. (C)
178. Which of the following fuels causes minimum environmental pollution?
(A) Diesel
(B) Kerosene
(C) Hydrogen
(D) Coal
Ans. (C)
179. Which of the following is the most important raw material for generation of power in India?
(A) Mineral Oil
(B) Natural Gas
(C) Uranium
(D) Coal
Ans. (D)
180. The purest form of water in nature is
(A) Rain water
(B) Lake water
(C) River water
(D) Sea water
Ans. (A)
181. Highest percentage of carbon is found in which form of coal?
(A) Anthracite
(B) Bituminous
(C) Peat
(D) lignite
Ans. (A)
182. Which one of the following is a good electrical conductor?
(A) Graphite
(B) Diamond
(C) Peat
(D) Charcoal
Ans. (A)
183. Which of the following acts as best adsorbent?
(A) Charcoal
(B) Activated Charcoal
(C) Activated Coconut Charcoal
(D) Carbon black
Ans. (C)
184. Which of the following metal has the least melting point?
(A) Gold
(B) Silver
(C) Mercury
(D) Copper
Ans. (C)
185. Which of the following elements has the lowest melting point?
(A) Iodine
(B) Lead
(C) Tin
(D) Mercury
Ans. (D)
186. Which is the highest quality of hard coal?
(A) Anthracite
(B) Bituminous
(C) Lignite
(D) Peat
Ans. (A)
187. Which of the following metal is the heaviest?
(A) Iron
(B) Silver
(C) Nickel
(D) Osmium
Ans. (D)
188. Which of the following metal has the lowest density?
(A) Lithium
(B) Iron
(C) Gold
(D) Vanadium
Ans. (A)
189. Which of the following is the most reactive in nature?
(A) Potassium
(B) Calcium
(C) Lead
(D) Copper
Ans. (A)
190. Which of the following is not a property of a metal?
(A) Hardness
(B) Lustrous
(C) Malleability
D) Poor conductivity of heat
Ans. (D)
191. Which of the following is an Inert gas?
(A) Hydrogen
(B) Nitrogen
(C) Oxygen
(D) Argon
Ans. (D)
192. Which of the following cannot be beaten into Sheets?
(A) Gold
(B) Silver
(C) Potassium
(D) Aluminium
Ans. (C)
193. Magnesium (Mg) + Oxygen (O) = ?
(A) Mg2O
(B) MgO4
(C) O2Mg
(D) MgO
Ans. (D)
194. Metals react with sodium hydroxide to produce
___________.
(A) Oxygen gas
(B) Sodium
(C) Water
(D) Hydrogen gas
Ans. (D)
195. Magnesium oxide (MgO) + Water (H2O) = ?
(A) [Mg(OH )]
(B) [Mg2(OH)]
(C) [Mg(O2H)2]
(D) [Mg(OH)2]
Ans. (D)
196. What is formed when Magnesium is burnt?
(A) Baking Soda
(B) Calcium Carbonate
(C) Ash
(D) Vinegar
Ans. (C)
197. The property of metal by which it can be drawn into wires is called _____________.
(A) Malleability
(B) Viscosity
(C) Ductility
(D) Tensile strength
Ans. (C)