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Chemistry

Chemistry
Percentage of carbon in steel ranges from

1.5 to 3.0
4.0 to 6.0
3.0 to 4.0
0.1 to 1.5

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Chemistry
The graphite rods in the nuclear reactor

react with U to release energy
undergo combustion which triggers the nuclear fission
convert fast moving neutrons into thermal neutrons
produce neutrons

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Chemistry
The monomer of polythene is

vinyl chloride
ethylene
ethyl alcohol
None of these

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Chemistry
Suspension particles have the size between

10–8 – 10–10cm
10–2 – 10–4 cm
10–5 – 10–7cm
10–1 – 10–2 cm

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Chemistry
Formation of ozone hole is maximum over

India
Africa
Antarctica
Europe

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Chemistry
Which one of the following elements is an example of noble gas ?

Nitrogen
Helium
Chlorine
Hydrogen

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