Materials: Metals and Non-Metals
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156
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179
Silver tarnishes due to (nitrogen oxides/hydrogen sulphide) in the air.
By Rohit1998, 5 years ago
replies 1
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127
Gold dissolves in (aqua regia/aqueous solution of silver nitrate).
By Rohit1998, 5 years ago
replies 1
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143
International standards of weights are made of (gold-silver / platinum-iridium) alloy.
By Rohit1998, 5 years ago
replies 1
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