Electrons can be deflected by which of the following?
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The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
Which one of the following is a good electrical conductor?
Which is the most economical method of removing solid matter from water?
Which of the following elements has the lowest melting point?
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
Terylene is a condensation polymer of ethylene glycol and which acid?
Which of the following has pH value 7?
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