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Chemistry

Chemistry
The percentage of oxygen in air is approximately

1
0.78
0.21
0.01

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Chemistry
The unit to measure the flow of water is

Ohm meter
Cusecs
Micro Mho
Milli curie

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Chemistry
The molecular mass of a gas is

Not related to its vapour pressure
Twice its vapour pressure
Half its vapour pressure
Equal to its vapour pressure

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Chemistry
Bauxite is an alloy of which of the following metals ?

Aluminium
Iron
Tin
Silver

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Chemistry
Water gas is the combination of

CO and H2
CO and H2O
CO2 and CO
CO2and H2

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Chemistry
A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

From brown to orange-red
From brown to blue-black
From blue to pink
From pink to blue-green

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