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The correct answer is D
The chief source of naphthalene is
Mercury is a :
When a spoon is to be electroplated with nickel the spoon is
Identify the metal which is nontoxic in nature.
Spirit in contact with body gives cool sensation because it is:
When Hydrogen starts burning in air it produces?
In addition to hydrogen the other abundant element present on Sunsurface is
The particle required to continue the chain process of Uranium fission is:
Which of the inert gases can form compounds?
The gas that usually causes explosions in coal mines is
