Question

the melting point of a solid when determined experimentally comes out to be 160 deg C .but its actual melting point as given in standard books is 150 deg C .predict the nature of solid .​

Answer 1

If the melting point of the solid has a large difference of over 10 C then there must be impurities present in the sample of solid taken.

Impurities in a solid cause a melting point depression because the impurity disrupts the crystal lattice energies. If the impurity present stabilizes the solid by say hydrogen bonding, then the impurity causes the melting point of the impure solid to increase instead of usually decreasing.

Thus the melting point of impure solid determined experimentally comes out to be 160 C but its melting point given in standard textbooks is 150 C for pure solid.