Question

Which of the following salt group is stimulatory or toxic in action?

(a) Sodium, potassium, calcium and magnesium

(b) Copper, zinc, sodium and magnesium

(c) Copper, calcium, magnesium and potassium

(d) Sodium, magnesium, zinc, and potassium

The question was posed to me in an interview.

I need to ask this question from Problem involved in Biogas Production topic in chapter Biomass Energy of Energy Engineering

Answer 1

Right answer is (a) Sodium, potassium, calcium and magnesium

Easiest explanation: Salts of sodium, potassium, calcium and magnesium may be stimulatory or toxic in action, both manifestations being associated with the cat-ion rather than the anionic portion of the salt. Pesticides and synthetic detergents may also be troublesome to the process.