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Chemistry

Chemistry
The chemical formula of the laughing gas is

NO2
N2O
NO
N2O3

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Chemistry
When a spoon is to be electroplated with nickel the spoon is

Coated with nickel sulphate and dried
Made anode and a pure nickel rod, the cathode
Made cathode and a pure nickel red, the anode
Dipped in a nickel sulphate solution

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Chemistry
Biofertilizers convert nitrogen to ________ .

Amino acids
Ammonia
Nitrogenase
Nitrates

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Chemistry
The nucleus of a hydrogen atom consists of

1 proton + 2 neutron
1 neutron only
1 proton only
1 electron only

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Chemistry
The heat value of combustion of Gasoline is

39400 kJ/kg
12600 kJ/kg
14600 kJ/kg
47000 kJ/kg

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Chemistry
Of the following, which one pollutes the air of a big city ?

Lead
Chromium
Copper
Cadmium

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