Question

1.Mohan was asked by his teacher to determine the boiling point of a liquid. He set up
the apparatus as shown in the figure. He recorded the boiling point of the liquid as
140°C and reported the reading to his teacher. The teacher asked him to repeat the
experiment after dipping the bulb of the thermometer in the liquid and also placing the
beaker on a tripod stand covered with a wire gauze. After reading this narration,
answer the following questions:
I. Was the reading taken by the student correct ?
II. What was the necessity of wire gauze ?
III. How did the teacher help the student ?
IV. What is the value based information associated with this ?

Answer 1

Answer:

(i) No, it was wrong, The bulb of the thermometer must dip in the liquid. <br> (ii) If the beaker is in direct contact with the flame, it might crack. <br> (iii) Teacher guided the student properly. By direct heating, an accident could occur and could cause serious injuries to the student. <br> (iv) In the laboratory or in the kitchan, we should never heat glass beakers or containers directly on the flame. These are likely to crack. However, Borocil beakers can be heated on direct flame.