Which of the following is not a Halon gas ?
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The nitrogenous waste of Human Beings is
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
Which among the following is false about natural rubber?
Raymond Samuel Tomilson is famous for developing which of the following?
Punched card is also called
Helium is added to the oxygen supply of deep sea divers because it is _________
_______ fiber is used in making bulletproof vests.