Bohr S Model For Hydrogen Atom

Degree of hardness of water is measured in terms of ppm by weight of irrespective of whether it is actually present or not.

Hydrogen peroxide, oxidises lead sulphide, to lead sulphate, in acidic medium

It reacts with hypochlorous acid, to produce water, oxygen and hydrochloric acid, showing oxidising action in acidic medium

is a non-stoichiometric hydrides. These are hydrogen deficient compounds formed by the reaction of dihydrogen with d-block and f-block elements. These hydrides do not follow the law of constant composition