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Q. Dry powder fire extinguishers contain
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Q. Which one is a naturally occuring noble gas?
Q. How many electrons are there in a Hydrogen atom?
Q. The compound(s) produced during the formation of photochemical smog is/are:
Q. Which one of the following is known as the 'brown coal'?
Q. It is dangerous to have coal or charcoal burning in a closed room because
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