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Q:

Name the noble gas which is placed in the third period and eighth group of the Modern Periodic table.

A) Helium B) Argon
C) Neon D) Krypton
 
Answer & Explanation Answer: B) Argon

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Q:

The Chemical formula of Ammonium oxalate is _____.

A) NH4C2O4 B) (NH4)2CO4
C) (NH4)2C2O4 D) (NH4)2C2O3
 
Answer & Explanation Answer: C) (NH4)2C2O4

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Q:

Which of the following green house gases has the greatest heat-trapping ability?

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

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Q:

According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.

A) molecule B) atom
C) compound D) element
 
Answer & Explanation Answer: B) atom

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Q:

Which is the most economical method of removing solid matter from water?

A) Using deactivated carbon B) Electrolysis
C) Distillation D) Sedimentation
 
Answer & Explanation Answer: D) Sedimentation

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Q:

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ________

A) Mercury is a metal B) Density of mercury is greater than that of water
C) Cohesion of mercury is greater than its adhesion with glass D) Cohesion of water is greater than its adhesion with glass
 
Answer & Explanation Answer: C) Cohesion of mercury is greater than its adhesion with glass

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Q:

Who invented the modern periodic table?

A) Faraday B) Mendeleev
C) Newton D) Bohr
 
Answer & Explanation Answer: B) Mendeleev

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Q:

Magnesium oxide (MgO) + Water (H2O) = ?

A) [Mg(OH)] B) [Mg(O2H)2]
C) [Mg2(OH)] D) [Mg(OH)2]
 
Answer & Explanation Answer: D) [Mg(OH)2]

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