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Chemistry

Chemistry
Which of the following metals can displace copper from copper sulphate solution ?

Iron
Mercury
Platinum
Gold

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Chemistry
Maximum permissible concentration of copper in drinking water in mg/L is

1
0.05
2
0.01

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Chemistry
If lime water is kept in the air, it turns milky due to presence of :

Sulphurdioxide
Oxygen
Nitrogen
Carbondioxide

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Chemistry
The molecular mass of a gas is

Equal to its vapour pressure
Not related to its vapour pressure
Twice its vapour pressure
Half its vapour pressure

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Chemistry
Which of the following substance is highly plastic ?

Granite
Mica
Quartz
Clay

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Chemistry
Which of the following is not a precious/semi-precious stone?

Emerald
Pearl
Ruby
Sapphire

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