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nitrogen
helium
oxygen
argon
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
Amalgams are
lightest metal is the
Which of the metals remain in liquid for under normal conditions
Potassium Permanganate is used for purifying drinking water