Q. Age of a fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are
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Q. Which of the following is called 'the King of Chemicals' ?
Q. How many groups and periods are present in the Modern Periodic Table?
Q. The molecules of which gas have highest speed?
Q. A mixture of two or more metals is called
Q. Copper substances when exposed to air gains a green coating due to the formation of:
Q. In an atom the order of filling up of the orbitals is governed by
Q. Ethylene is a ______ molecule
Q. Alcoholic fermentation is brought about the action of
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