Q442
In chemical terms, what are alums used for purifying water for drinking purposes ?
A.
Hydrated chlorides
B.
Double nitrate
C.
Double sulphates
AnswerD.
Nitrates of aluminium
Answer: Option C
Solution
Answer: Option C
Solution:
Alum is double sulphates having the composition M2SO4. M2(SO4)3.24H2O.
Where M stands for monovalent basic radicals. Alums have Germicide properties and thus used in purification of water.