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Q. A substance emits energy which is detected as a line emission in the visible region using a spectroscope. The origin of this energy is
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Q. The chemical bahaviour of an atom depends upon
Q. Which one of the following metals is used to galvanise iron ?
Q. Ozone depletion in the atmosphere is mainly caused by
Q. Temporary hardness is due to the presence of
Q. The main use of magnesia is as a (an)
Q. The hardened material available on earth is
Q. The non-metal found in the liquid state is
Q. In natural gas, the compound present in major amounts is made up of hydrogen and
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