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Chemistry

Chemistry
The most abundant element by number in the living system is :

Hydrogen
Nitrogen
Carbon
Oxygen

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Chemistry
Which of the following produces highest amount of energy upon oxidation?

Fat
Protein
An alkane
Glucose

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Chemistry
Which of the following in automobile exhaust can cause cancer?

Lead
Polyclinic hydrocarbons
Carbon monoxide
Oxides of nitrogen

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Chemistry
Atoms of same element having different mass numbers are called________

Isobars
Isotopes
Isotones
Isomers

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Chemistry
Number of neutrons in an atom of hydrogen is

Zero
Three
One
Two

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Chemistry
Which of the following is used as a preservative to protect processed food?

Sodium sulphate
Saccharin
Sodium metabisulphite
BHT

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