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Chemistry

Chemistry
Earth’s atmosphere is an envelope of gases extending to a height of

150 km
100 km
200 km
300 km

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Chemistry
The metal used to recover copper from a solution of copper sulphate is

Hg
Ag
Na
Fe

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Chemistry
The scientist who experimentally proved the existance of positron is

Anderson
Fermi
Bohr
Bethe

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Chemistry
The mass number of an atom is equal to

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

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Chemistry
Among the following the hardest metal is

Iron
Gold
Platinum
Tungsten

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Chemistry
The lowest layer of earth's atmosphere is

Ionosphere
Troposphere
Stratosphere
Mesosphere

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MORE MCQ ON Chemistry

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