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Chemistry

Chemistry
Number of neutrons in an atom of hydrogen is

Two
Zero
One
Three

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Chemistry
Commercial Vaseline is derived from

Wool wax
Coal tar
Petroleum
Plant gums

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Chemistry
The number of waves in n x 10th Bohr's orbit are

n-2
n
n3
n2

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Chemistry
When iron rusts, its weight

First increases and then decreases
Increases
Decreases
Remains the same

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Chemistry
Adding Cl2 to benzene in the presence of AlCl3 is an example of :

None of the options
Elimination reaction
Addition reaction
Substitution reaction

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Chemistry
Brass gets discoloured in air due to constant exposure in presence of:

Hydrogenated wafers
Hydrogen sulphide
Aluminium sulphide
Aluminium phosphide

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