Q. Some of the mineral elements required in extremely small quantities (traces) are called microelements. Group of such elements are
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Q. Which of the following pollutants is main product of automobile exhaust ?
Q. The most important ore of aluminium is
Q. Rusting of iron takes place due to
Q. A balloon filled with helium rises in air because
Q. Hydrogen fuel cell vehicles produce one of the following as'exhaust'
Q. A mixture of sand and salt can be separated by ?
Q. Of the following, which element is common to all acids
Q. The metallurgical process in which a metal is obtained in a fused state is called
Q. Which among the following oxides cause the Acid rain ?
Q. The liquid waste from kitchens and baths, of residences is known as :
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