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Chemistry

Chemistry
The hardest form of carbon is

charcoal
graphite
diamond
coke

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

n3
n2
n
n-2

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Chemistry
Polythene is polymer of

Propylene
Acetylene
Ethylene
Aniline

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Chemistry
The metal does not give H2 on treatment with dilute HCL is

Ag
Ca
Fe
Zn

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Chemistry
Which of the following is not a nucleon?

Electron
Positron
Neutron
Proton

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

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

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