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  • An example of alum is Option: 1 <img alt="Al_2(SO_4)_3\cdot Na_2SO_4\cdot 12H_2O" src="https://learn.careers360.com/latex-image/?Al_2%28SO_4%29_

An example of alum is 

Option: 1

Al_2(SO_4)_3\cdot Na_2SO_4\cdot 12H_2O


Option: 2

FeSO_4(NH_4)_2SO_4 \cdot 6H_2O


Option: 3

K_2 SO_4 \cdot Al_2 (SO_4)_3 \cdot 24H_2O


Option: 4

FeSO_4\cdot Al_2(SO_4 )_3 \cdot 24 H_2O


Answers (1)

best_answer

As we have learned

Alums -

Term alum is given to double sulhates of the type M_{2}SO_{4}\cdot M_{2}^{1}\left ( SO_{4} \right )_{3}\cdot 24H_{2}O

M=univalent cation like Na+, K+ and NH4+

M1 = trivalent cation like Al3+, Fe3+ and Cr3+

-

 

 Sulphate of monovalent atom (k^+ , Na ^+ , NH^{4+})  and 

 

sulphate of trivalent atom (Al^{3+},Cr ^{3+},Fe^{3+})form alum with  24 H_2O  molecule 

 

Posted by

sudhir.kumar

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