The correct option is B False
In industries, when hard water is boiled in a boiler, a stone like deposit called scaling is formed at the bottom of a boiler. It is a bad conductor of heat. More scaling occurs as more and more hard water is boiled.
On further heating the scaling develops cracks and the pressure inside the boiler increases. This increase in pressure could lead to a dangerous boiler blast. Hence hard water is neither economical nor safe to be used in industries.