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germanium
carbon
silicon
sulphur
In fireworks, the green flame is produced because of
Permanent hardness of water can be removed by adding
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