56.Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : A buffer solution maintains a reasonably constant pH over a period.Reason (R) : It contains reserves of acidity and alkalinity.

57.Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : High up in the mountains, some food cannot be properly cooked in boiling water.Reason (R) : A pressure cooker will not be useful for people living at high altitudes.

58.The coolant used in car radiators is

59.Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : A white porcelain plate with black design on it heated to a high temperature. It is then suddenly taken into a dark room. It is observed that the black design appears bright while the white porcelain background remains dark. 2. Reason (R) : Good absorbers of heat are good radiators.

60.During the fermentation of sugras, the enzyme which converts glucose into ethyl alcohol is