किसी द्रव का तापमान बढ़ने पर उसके पृष्ठ तनाव (surface tension) और श्यानता (viscosity) में क्या परिवर्तन होते हैं?

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A sharp glass edge becomes smooth on heating it up to its melting point. Reason R: The viscosity of glass decreases on melting. Choose the most appropriate answer from the options given below:

At 20°C, pure water requires 102.2 seconds to flow through the capillary of an Ostwald viscometer, while toluene at 20°C requires 68.9 seconds. Calculate the relative viscosity of toluene with respect to water. The densities of water and toluene at this temperature are 0.998 g cm-3 and 0.866 g cm-3 respectively.