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Chemistry

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

n3
n-2
n
n2

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Chemistry
Food cans are coated with tin and not with zinc because

Zinc is more reactive than tin
Zinc has a higher melting point than tin
Zinc is costlier than tin
Zinc is less reactive than tin

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Chemistry
Nucleons are regarded as composites sub-particles known as

Leptons
Mesons
Photons
Quarks

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Chemistry
The most abundant element in the earth’s atmosphere is

Nitrogen
Krypton
Oxygen
Argon

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Chemistry
What is the mass percentage of carbon in carbon dioxide (CO2)

0.323
0.201
0.273
0.158

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Chemistry
Yellow Cake' an item of smuggling across border is

Uranium oxide
A crude from of cocaine
Unreformed gold
A crude from of heroin

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