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Q. An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number
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Q. Permanent hardness of water is due to the presence of ?
Q. The gas that usually causes explosions in coal mines is
Q. The chief constituent of vinegar is
Q. What is the product formed when sodium bicarbonate is heated strongly -
Q. The gas used for cooking (LPG) is chiefly a mixture of
Q. Which among the given is usually not an air-pollutant
Q. The depletion in Ozone layer is caused by ___________.
Q. Which among the given alkali metals has highest specific heat -
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