Chemistry- Questions and Answers 04
91. Which of the following is the lightest metal?Answer: Lithium
92. Carborundum is —
Answer: Silicon Carbide
93. Carbon, diamond and graphite are together called
Answer: allotropes
94. The most important ore of Aluminium is–
Answer: Bauxite
95. Which of the following is the best conductor of electricity?
Answer: Silver
96. From which mineral is radium obtained?
Answer: Pitchblende
97. The element present in the largest amount in rocks and minerals is–
Answer: Silicon
98. Washing soda is the common name of —
Answer: Sodium Carbonate
99. Tetraethyl lead is used as
Answer: Petrol additive
100. The chemical name of Uria is–
Answer: Carbamide
101. The filament of an electric bulb is made of —
Answer: Tungsten
102. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Answer: zeolites
103. Permanent hardness of water can be removed by adding–
Answer: Washing Soda
104. Bleaching powder is made from —
Answer: Lime and Chlorine
105. Which of the following metals remains in liquid form under normal conditions?
Answer: Mercury
106. The formula of Plaster of Paris is–
Answer: 2CaSO4, H2O
107. The two elements that are frequently used for making transistors are —
Answer: Silicon and Germanium
108. By fixation of nitrogen is meant-
Answer: Conversion of atmospheric nitrogen into Useful compounds
109. Liquefied Petroleum gas (LPG) consists of mainly–
Answer: Methane, Butane and Propane
110. Which of the following gas is not known as a greenhouse gas?
Answer: Nitrous oxide
111. When water freezes its density-
Answer: Decreases
112. Atoms of the same element, i. e., having the same atomic number that differ in atomic weight, is called-
Answer: Isotopes
113. The metal that is present in Photo Films is–
Answer: Silver
114. Which of the following is not a neutral oxide?
Answer: Sulphur Dioxide
115. The manufacture of iron ore involves the process of-
Answer: Reduction
116. Which of the following is in liquid form at room temperature?
Answer: Francium
117. Which of the following is used in making smoke bombs?
Answer: Phosphorus
118. Which of the following has the strongest Bleaching property?
Answer: Chlorine
119. The property of a substance to absorb moisture from the air on exposure is called–
Answer: Deliquescene
120. Caustic Soda is —
Answer: NaOH
121. Nitric acid does not react with-
Answer: Gold
122. Brass gets discoloured in the air due to the presence of which gas in the air–
Answer: Hydrogen Sulphide
123. Which of the following is not a bleaching agent?
Answer: Carbon dioxide
124. Oxygen is manufactured by the fractional Evaporation of-
Answer: Liquid air
125. Quartz crystals normally used in quartz clocks etc. is chemical–
Answer: Silicon dioxide
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