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Chemistry

Chemistry
Submarines move under water. They have engines that run on

Diesel
Steam
Batteries
Petrol and oxygen

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Chemistry
Which of the following chemicals is used in photography ?

Potassium nitrate
Aluminium hydroxide
Silver bromide
Sodium chloride

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Chemistry
Which of the following is used as a lubricant in heavy machines?

Bauxite
Phosphorus
Graphite
Sulphur

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Chemistry
Ruby and sapphire are oxides of

Aluminium
Iron
Tin
Copper

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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

5x
7.2 x
5x/36
x/6

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Chemistry
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

All of these
O3
CO
CO2

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