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Q. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
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Q. A balloon filled with helium rises in air because
Q. The first metal used by a man was
Q. Which of the following is NOT correct about the use of Quick lime?
Q. Which group in the modern periodic table contains elements that are inert gases?
Q. The shape of a carbon molecule is
Q. The purity of primary gold is
Q. Atomic weight of an element is given by
Q. An important green-house gas other than methane being produced from the agricultural fields is
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