Melting points of four solids A, B, C and D are 78 degree celcius, 262 degree celcius, 100 degree celcius and 168 degree celcius. Arrange the solids in the order of their inter particle force of attraction.

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Solution

* The melting point of a solid is proportional to the inter particle force of attraction
* Reason: More heat is required for change of state (melting) in the case of more force of attraction exists between the particles
* Arrangement: More to less force of attraction -- B, D, C, A

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