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Q. The polymerisation of Which among the given is used in manufacturing of polythene in industry -
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Q. The commercial name for calcium hydride is
Q. _____ gives hardness to stainless steel.
Q. Brass gets discoloured in air because of the presence of which of the following gases in air?
Q. The chemical substance present in bones and teeth is :
Q. What determines the colour of a star?
Q. Fermentation of milk to curd is due to:
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