Question

Please answer with an explanation.

Read the passage given below and answer questions 39 and 40 by choosing the
correct alternative

The basic principle of calorimetry is as follows: Heat gained by one body = Heat lost by other body. This
statement follows from the law of conservation of energy.

An aluminium container of mass 100 g contains 200 g of ice at -20 °C. Heat is added to the system at the
rate of 420 J/ s. Specific heat capacity of ice = 2100 J /kg /K,
specific heat capacity of aluminium = 840 J /kg/K and latent heat of fusion of ice = 3.36 x 10^5 J /kg.

The time required to raise the temperature of the container and ice from -20 °C to 0°C is
(A) 12 s
(B) 24 s
(C) 36 s
(D) 48 s

40. The time required to melt ice at 0 °C into water at 0 °C is
(A) 40 s
(B) 80 s
(C) 120 s
(D) 160 s
​

Answer 1

Answer:

(B) 24 s

40. (C) 120 s

hope it will help u ....