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 Chemistry Questions

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Q:

What is the pH value of human blood?

A) 8.3 B) 6.8
C) 7.4 D) 6
 
Answer & Explanation Answer: C) 7.4

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Q:

Who formulated ‘the atomic theory’ of a matter?

A) Avogadro B) Dalton
C) Newton D) Pascal  
 
Answer & Explanation Answer: B) Dalton

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Q:

What is the chemical name of chalk?

A) Calcium Sulphate B) Calcium Nitrate
C) Calcium Carbonate D) Calcium Phosphide
 
Answer & Explanation Answer: C) Calcium Carbonate

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Q:

Which electron dot formula represents a polar molecule?

A) A B) B
C) C D) D
 
Answer & Explanation Answer: B) B

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Q:

Which of the following is false?

A) Hydrogen atom is roughly a third of the mass of tritium B) Deuterium is called heavy hydrogen
C) Deuterium atom has 1 neutron D) Protium is the rarest isotope of hydrogen
 
Answer & Explanation Answer: D) Protium is the rarest isotope of hydrogen

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Q:

Which of the following is NOT the combined from of carbon?

A) Diamond B) Dolomite
C) Marble D) Chalk
 
Answer & Explanation Answer: A) Diamond

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Q:

When iron is exposed to moist air, a reddish brown coating of hydrated Iron (III) Oxide (Fe2O3) is deposited on its surface. This reddish brown coating is called

A) alloy B) dust
C) rust D) iron
 
Answer & Explanation Answer: C) rust

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Q:

Isobars have _______.

A) Same mass numbers but different atomic numbers B) Different mass numbers but same atomic numbers
C) Same mass and atomic numbers D) Different mass and atomic numbers
 
Answer & Explanation Answer: A) Same mass numbers but different atomic numbers

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