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Chemistry

Chemistry
Which one of the following species has the highest bond order, shortest bond length and maximum bond strength

O-2
O-22
O2
O+2

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Chemistry
Helium is added to the oxygen supply of deep sea divers because it is

Readily miscible with oxygen
Less poisonous than nitrogen
Less soluble in blood than nitrogen at high pressure
Lighter than nitrogen

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Chemistry
In drinking water supply, which of the following treatments is not involved

Disinfection
Coagulation
Sedimentation
Softening

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Chemistry
Cloud is a colloidal dispersion of

Water drops in a dispersion medium of air
Fog in a dispersion medium of water
Air in a dispersion medium of water
Mist in a dispersion medium of air

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Chemistry
Which one is a soluble salt in H2O

CuS
PbCl2
CaCl2
Zn(OH)2

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Chemistry
Which gas does not form the part of atmosphere ?

Nitrogen
Helium
None of these
Chlorine

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