The chemical formula of magnesium bicarbonate is ………….
a) MgCO3
b) MgO
c) CaCO3
d) Mg(HCO3)2
Water may also dissolve…………..
a) chlorides
b) magnesium
c) sulphate
d) all of these
Underground water contains………which make the water hard.
a) magnesium ion
b) calcium ion
c) both a & b
d) none of these
There are ………..types
of water is due to the dissolved salt.
a) 2
b) 3
c) 4
d) 5
The temporary hardness of water is due to the dissolved…………….
a) Ca(HCO3)
b) Mg(HCO3)
c) both a & b
d) none of these
