The amorphous substances do not melt at a sharp temperature ,rather they have a softening range .Explain this obsrvation.

Pragya tested the solubility of three different substances at different tem¬ peratures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution tocool atroom temperature. What would she observe asthesolution cools ? Explain

para - isomers have high melting point as compared to ortho and meta-isomers. Explain.

Why crystalline solids have a sharp melting point?

The voltage current variation of two metallic wires X and Y at constant temperature are a shown in the figure HQ. 7. Assuming that the wires have the same length and the same diameter explain which of two wires will have larger resistivity.