1.

Which of the following is known as alum ?

Answer»

`K_2SO_4. Al_2(SO_4)_3. 24H_2O`
`(NH_4)_2SO_4. FeSO_4. 6H_2O`
`(NH_4)FE(SO_4)_2. 12H_2O`
NONE of the above

Answer :A


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