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Chemistry

Chemistry
CNG used in automobiles to check pollution, mainly consists of

CO2
CH4
N2
H2

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Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Krypton
Neon
Argon
Helium

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Chemistry
The water pollution in river is measured by the dissolved amount of

Nitrogen
Chlorine
Ozone
Oxygen

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Chemistry
Which one is heaviest naturally-occurring element of the periodic element

Uranium
Thorium
Iron
Rhodium

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Chemistry
Which of the following chemicals is used in photography ?

Sodium chloride
Aluminium hydroxide
Silver bromide
Potassium nitrate

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Chemistry
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

7.2 x
5x/36
5x
x/6

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