Question

Liquid oxygen at 50K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

Answer 1

Correct option is : (a) 885°C

Heat gained by (water + calorimeter) = Heat lost by copper ball

⇒ 100 x 0.1 x (75 - 30) + 170 x 1 x (75 - 30)

= 100 x 0.1 x (T - 75)

⇒ 450 + 7650 = 10(T - 75)

⇒ T - 75 = 810

⇒ T = 885°C