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Chemistry

Chemistry
Which of the following is used to remove rust stains on cloth?

Kerosene
Oxalic acid solution
Lime
Petrol

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Chemistry
The chemical formula of the laughing gas is

N2O3
NO2
NO
N2O

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Chemistry
Which one of the following species has the highest bond order, shortest bond length and maximum bond strength

O2
O-2
O+2
O-22

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Chemistry
The mass number of an atom is equal to

the number of protons
the number of neutrons
the number of nucleons
the number of protons and electrons

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Chemistry
The hardest form of carbon is

diamond
graphite
coke
charcoal

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Chemistry
Combustion of a candle is a/an

Exothermic reaction
Endothermic reaction
Physical change
Photochemical reaction

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MORE MCQ ON Chemistry

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