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Q:

Which of the following elements has the lowest melting point?

A) Sodium B) Tin
C) Radon D) Radium
 
Answer & Explanation Answer: C) Radon

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Q:

Inert gases are

A) Miscible with water B) Not stable
C) Chemically unreactive D) Chemically very active
 
Answer & Explanation Answer: C) Chemically unreactive

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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:

What is the net charge on Calcium fluoride?

A) 1+ B) 0
C) 1­- D) 2­-
 
Answer & Explanation Answer: B) 0

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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:

What is the common name of the solution of calcium hydroxide?

A) Lime water B) Diet soda
C) Salt solution D) Vinegar
 
Answer & Explanation Answer: A) Lime water

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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:

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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