Chemistry
Aspirin is

Acetyl Salicilic acid
Phenyl Salicilate
Methyl Salicilate
Methoxy benzoic acid

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Chemistry
The mass number of a nucleus is

the sum of the number of protons and neutrons present in the nucleus
a fraction
always more than the atomic weight
always less than its atomic number

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

The flame is too hot for water to cool it down
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Water and petrol react chemically
Water and petrol are miscible with each other

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