Chemistry Questions

Q:

Which of the following elements has the lowest melting point?

A) Xenon B) Iodine
C) Barium D) Magnesium
 
Answer & Explanation Answer: A) Xenon

Explanation:
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Q:

Infiltration is the process by which rainwater becomes

A) river water B) ground water
C) salt water D) ocean water
 
Answer & Explanation Answer: B) ground water

Explanation:

The process of absorbtion of rain water by the soil on the earth is called infiltration. By this process, the rain water that falls on the soil becomes ground water.

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Q:

Which of the following elements has the electronic configuration 2, 8, 3?

A) Magnesium B) Sodium
C) Aluminium D) Argon
 
Answer & Explanation Answer: C) Aluminium

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Q:

Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of

A) Calcium Carbonate B) Barium Carbonate
C) Calcium Hydrogen Carbonate D) Calcium Oxide
 
Answer & Explanation Answer: A) Calcium Carbonate

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Q:

Which of the following acts as best adsorbent?

A) Charcoal B) Activated Charcoal
C) Activated Coconut Charcoal D) Carbon black
 
Answer & Explanation Answer: C) Activated Coconut Charcoal

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Q:

Which among the following is an example of mixture?

A) Milk B) Gasoline
C) Liquefied petroleum gas D) All options are correct
 
Answer & Explanation Answer: D) All options are correct

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Q:

How many elements are present in the group of the 18th Modem Periodic Table?

A) 5 B) 2
C) 6 D) 7
 
Answer & Explanation Answer: D) 7

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Q:

What determines the mass number of an element?

A) Number of protons B) Number of electrons and protons
C) Number of protons and neutrons D) Number of neitrons
 
Answer & Explanation Answer: C) Number of protons and neutrons

Explanation:

The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.

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