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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Oxygen
Magnesium
Iron
Silicon

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Chemistry
The quality of petrol is expressed in terms of

Gold number
Octane number
Added unlead compounds
Cetane number

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Chemistry
Normal rainwater has a pH level of

6.3
3.2
5.6
8.3

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Chemistry
If there is one million Mg2+ ions in MgCl2, how many chloride ions are there?

Two million
One million
Ten million
Half a million

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Chemistry
Which substance is used to retard the setting action of cement?

CaSO4, 2H2O
Na2O + K2O
Al2O3
CaO

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Chemistry
Aluminium salt commonly used to stop bleeding is

Aluminium sulphate
Aluminium nitrate
Potash alum
Aluminium Chloride

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MORE MCQ ON Chemistry

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