Chemistry
In chemical terms, what are alums used for purifying water for drinking purposes ?

Nitrates of aluminium
Double sulphates
Hydrated chlorides
Double nitrate

ANSWER DOWNLOAD EXAMIANS APP

Chemistry
The mass number of a nucleus is

always more than the atomic weight
the sum of the number of protons and neutrons present in the nucleus
a fraction
always less than its atomic number

ANSWER DOWNLOAD EXAMIANS APP