1.

Read the two statements -(I) When a solid melts and changes to liquid state, its volume may increase on decrease. (II) As a result of increase in pressure, the melting point at a solid may be raised or lowered. With reference to these statements, the only correct statements out of the following's

Answer»

(I) is true but (II) cannot be true
(I) cannot be true but (II) is true
(I)and (II) both are true and (I) is the cause of (II)
(I) and (II) both are true and they are independent of each other.

Solution :An increase in pressure tends to COMPRESS the substance. On MELTING if volume of a substance decrease, an increases in pressure will help the process of melting, so that melting point will be lower. On the other hand if volume of a substance increase on melting, then an increase in pressure will OPPOSE the process of melting. Hence, melting point will increases. Thus, the two statements are true and (I) is the cause of (II). CORRECT choice is (c ).


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