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Q. The mercury & sodium street lamps light up as of:
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Q. The electric cell is a device to obtain
Q. Uranium eventually decays into a stable isotope of -
Q. When an iron nail gets rusted, iron oxide is formed
Q. The green colour seen in firework displays is due to the chloride salt of:
Q. Sensitivity of the human eye is max. in the
Q. An ideal gas is one which obeys
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