91. Which of
the following is the lightest metal ?
Answer: Lithium
92. Carborandum 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
chemial name of Uria is–
Answer: Carbamide
101. The
filament of 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 Germenium
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 green house gas ?
Answer: Nitrous
oxide
<Continue...>
<Continue...>
No comments:
Post a Comment