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2015-04-06T23:42:08+05:30

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The way to arrange them is:

the more the interparticle or inter-molecular attractions inside a compound or element, the higher the melting point and the boiling point are.

So  M.P. of  x = 298 K
     M.P. of y = 314 K

increasing order of inter particle force attraction :  x , y

1 5 1