Question

1 ppm = ____________

(a) 0.07 ^0Fr

(b) 0.7^0Fr

(c) 0.1^0Fr

(d) 0.01^0Fr

This question was posed to me in a national level competition.

This interesting question is from Hardness of Water topic in section Water and its Treatment of Engineering Chemistry II

Answer 1

Right choice is (c) 0.1^0Fr

To explain I would say: 1 ppm = 0.1^0Fr. It is calculated mathematically.