Question

Melting point of three substances A, B and C are 52 degree Celsius , 175 degree Celsius and 80 degree Celsius. Arrange them in the descending order of inter particle force of attraction and give reason for ur answer.

Answer 1

Hi Dear !
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Melting Point Of Substance A = 52°   Celsius 
Melting Point Of Substance B = 175° Celsius
Melting Point Of Substance C = 80°   Celsius
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Descending Order of inter particle force of attraction is :
175° Celsius > 80° Celsius > 52° Celsius 
because , inter molecular force of attraction would increase when melting point rises .
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Answer 2

Answer:

The melting point of any substance depends on the strength of the bond. As stronger the bond, the higher will be its melting point. And bond strength is a function of the inter-particle force of attraction.

The more the internal force of attraction the more will be its bond strength.

Substance A has the lowest melting point, then it will have the lowest inter-particle force of attraction. Substance B will have moderate inter-particle attraction force and C will have highest inter-particle attraction force.

Descending order of Melting point:

Subtance C < Substance B < Substance A

As a result, descending order of inter particle force of attraction:

Subtance C < Substance B < Substance A

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