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chlorine
washing soda
potassium permanganate
bleaching powder
Marsh gas is
LPG consists of mainly
Air is a/an
Balloons are filled with
Which of the following does not contain a coinage metal
Which metal pollute the air of a big city
Bell metal is an alloy of
Water is a good solvent of ionic salts because
Which of the following is not an isotope of hydrogen
the main constituents of pearls are