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 Chemistry Questions

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Q:

Carnotite is an ore/mineral of _____.

A) Beryllium B) Chromium
C) Uranium D) Copper
 
Answer & Explanation Answer: C) Uranium

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Q:

Which of the following are highly compressible?

A) Solid B) Liquid
C) Gas D) Solid and Liquid
 
Answer & Explanation Answer: C) Gas

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Q:

Atomic number of which of the following elements is greater than that of Magnesium

A) Neon B) Fluorine
C) Sodium D) Aluminium
 
Answer & Explanation Answer: D) Aluminium

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Q:

The chemical formula of Sodium Carbonate is

A) Na3CO2 B) Na2CO
C) NaCO3 D) Na2CO3
 
Answer & Explanation Answer: D) Na2CO3

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Q:

The depletion in Ozone layer is caused by ___________ .

A) Nitrous oxide B) Carbon dioxide
C) Chlorofluorocarbons D) Methane
 
Answer & Explanation Answer: C) Chlorofluorocarbons

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Q:

Which of the following statement(s) is/are INCORRECT regarding Phosphorus?

A) Phosphorus reacts vigorously with water B) It is a non-metal
C) It catches fire on reacting with air D) It is found in group 15 of the modern periodic table
 
Answer & Explanation Answer: A) Phosphorus reacts vigorously with water

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Q:

Which of the following gases is heavier than oxygen?

A) Carbon dioxide B) Ammonia
C) Methane D) Helium
 
Answer & Explanation Answer: A) Carbon dioxide

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Q:

The   chemical   properties   of   an   element depend upon

A) the number of isotopes of the element B) the mass number of the element
C) the  total  number  of  neutrons  in  the element D) the    number    of    electrons    in    the outermost shell of the element
 
Answer & Explanation Answer: D) the    number    of    electrons    in    the outermost shell of the element

Explanation:

Chemical  properties of  an element depend   on the number   and   the configuration   of   their   (valence) electrons.

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