A heating coil rated 1000W is used to boil off completely 2kg of boiling water. the time required to boil the water is? [Special latent heat of Vaporization of water = 2.3 x 106 Jkg‾¹]

A. 1.15 x 10⁴s
B. 1.15 x 10³s
C. 4.6 x 10⁴s
D. 4.6 x 10³s

Correct Answer:

Option D = 4.6 x 10³s

Explanation

Heat supplied = Heat gained
pt = ml
T = (ml)/p = (2 x 2.3 x 10⁶)/1000 = 4.6 x 10³ sec