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Q. Bohr's theory of fixed orbits contradicts
Q. The most abundant inert gas in the atmosphere is
Q. It is not advisable to sleep under a tree at night because trees release _______ at night
Q. Which of the gas is not known as green house gas?
Q. Which among the given is usually not an air-pollutant
Q. Methane contributes towards global warming so it is called a _________________ gas.
Q. Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?
Q. Which of the following substances is sour due to lactic acid?
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