All the heat generated by a current of 2A passing through a resistor of 6Ω for 2.5s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?

A. 60 Jg−¹
B. 120 Jg−¹
C. 300 Jg−¹
D. 360 Jg−¹
E. 1500 Jg−¹

Correct Answer: Option B

Explanation

Electrical Energy = Heat Energy.
I²Rt = ml
2² x 6 25 = 5 x L.
L = 120 Jg-1.

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