Which one of the following is a good electrical conductor?
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The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
____ is not an allotrope of carbon.
Name the noble gas which is placed in the third period and eighth group of the Modern Periodic table.
_____ is the major component of natural gas.
Which of the following elements has the lowest melting point?
Which of the following has pH value 7?
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
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