Question

Which of the following should not be a composition of boiler-feed water?

(a) Hardness should be below 0.2ppm

(b) Its caustic alkalinity should lie between 0.15 to 0.45 ppm

(c) Its soda alkalinity should be 0.45-1 ppm

(d) Its caustic alkalinity should be 1.5-2 ppm

The question was asked in an interview for job.

The question is from Boiler Feed Water topic in chapter Water and its Treatment of Engineering Chemistry II

Answer 1

Right option is (d) Its caustic alkalinity should be 1.5-2 ppm

The best explanation: Its caustic alkalinity should be 0.15-0.45 ppm. All the other options are correct. Hardness should be below 0.2ppm, caustic alkalinity should lie between 0.15 to 0.45 ppm and soda alkalinity should be 0.45-1 ppm.