Use the following information to answer the next question.
Sunita took an iron nail, a lump of alum, and a chalk piece. She hammered them one by one and observed that the chalk piece was the easiest to break, followed by alum, and then the iron nail.
What is the order of the three substances according to the increase in their forces of attraction?
Options:
1. Iron nail
2. Chalk piece
3.Lump of alum
4. Chalk piece

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Solution

The less the force of attraction between the molecules of a substance, the easy it will be to break the substance. It means that the molecules are loosely packed within the substance.
According to above observation, the order of the given 3 substances according to the increase in their force of attraction is given by :
Chalk piece < Lump of Alum < Iron nail.

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