Water quality can be maintained by promoting awareness campaign among people about…………
a) water quality
b) shortage of water
c) water quantity
d) none of these
People may be made aware not to put wastes and toxic substances into the running water, to maintain the ……….of water.
a) pH
b) temperature
c) both a & b
d) none of these
Composition of water:-
Water is composed of ………
a) hydrogen
b) oxygen
c) both a & b
d) none of these
Before …….., water was considered as an element.
a) 1774
b) 1775
c) 1776
d) 1777
……….. proved experimentally that water is not an element, but is a compound.
a) Lewis
b) Bronsted
c) Henry Cavendish
d) Guldberg
