p-Block elementsHard
Question
Alum is found to contain hydrated monovalent cation [M(H2O)6]+, trivalent cation [M′(H2O)6]3+ and SO42- in the ratio of :
Options
A.1 : 1 : 1
B.1 : 2 : 3
C.1 : 3 : 2
D.1 : 1 : 2
Solution
Formula of alums contain the ions [M(H2O)6]+, [M′(H2O)6]3+ and SO42- in the ratio 1 : 1 : 2.
Example : (i) Potash alum K2SO4 . Al2(SO4)3. 24H2O ; (ii) Chrome alum K2SO4. Cr2(SO4)3. 24H2O
Example : (i) Potash alum K2SO4 . Al2(SO4)3. 24H2O ; (ii) Chrome alum K2SO4. Cr2(SO4)3. 24H2O
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