121. The chemical used as a fixer in photography is
A. sodium sulphate
B. borax
C. sodium thiosulphate
D. ammonium sulphate
122. Which one of the following is the softest?
A. sodium
B. iron
C. aluminium
D. lithium
123. Which one of the following is an element?
A. ruby
B. topaz
C. sapphire
D. diamond
124. Which one of the following is also called Stranger Gas?
A. Neon
B. Argon
C. Xenon
D. Nitrous oxide
125. For which one of the following is the density maximum?
A. Ice
B. Water
C. Benzene
D. Chloroform
126. The alcohol used in power alcohol is
A. propanol
B. ethyl alcohol
C. methyl alcohol
D. ethylene glycol
127. The reaction between methane and chlorine in diffused sunlight is
A. oxidation
B. reduction
C. polymerisation
D. substitution
128. The alloy of aluminium used for making magnet is
A. duralumin
B. Y–alloy
C. alnico
D. aluminium bronze
129. Bleaching powder contains
A. nitrogen
B. iodine
C. chlorine
D. bromine
130. Which one of the following gases is readily soluble in water at room temperature?
A. chlorine
B. nitrogen
C. ammonia
D. carbon dioxide
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131. Radon is
A. germon radio
B. inert gas
C. artificial fibre
D. an explosive
132. pH of water is
A. 4
B. 7
C. 12
D. 18
133. pH of blood is
A. 4
B. 6.4
C. 7.4
D. 8
134. Natural rubber is a polymer derived from
A. isoprene
B. ethylene
C. propylene
D. butadiene
135. First atomic theory was proposed by
A. John Dalton
B. E.Rutherford
C. De Broglie
D. D.I.Mendeleef
136. Which substance is obtained by the hydrolysis of oil?
A. ethanol
B. glycol
C. acetic acid
D. glycerol
137. Washing soda is
A. sodium sulphite
B. sodium bicarbonate
C. sodiun carbonate
D. sodium biosulphite
138. Air contains maximum amount of
A. oxygen
B. nitrogen
C. hydrogen
D. carbon dioxide
139. Human bone does not contain
A. calcium
B. carbon
C. oxygen
D. phosphorous
140. Homo nuclear molecules contain
A. polar bond
B. covalent bond
C. ionic bond
D. coordinate bond
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141. Normal valency of nitrogen is
A. 2
B. 3
C. 4
D. 5
142. The isotope atoms differ in
A. atomic number
B. number of protons
C. number of electrons
D. atomic weight
143. Nucleus of an atom contains
A. electrons
B. protons
C. electrons and protons
D. protons and neutrons
144. Which one of the following does not contain silver?
A. Horn silver
B. Ruby silver
C. German silver
D. Lunar caustic
145. Nail polish remover contains
A. acetone
B. benzene
C. acetic acid
D. petroleum ether
146. What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A. paint
B. glass
C. gun powder
D. cement
147. Which is the heaviest metal?
A. iron
B. mercury
C. nickel
D. osmium
148. Bleaching action of chlorine is by
A. oxidation
B. reduction
C. decomposition
D. hydrolysis
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