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InterviewSolution
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Which of the following is known as pseudo alum?A. `KMn(SO_(4))_(2).12H_(2)O`B. `KCr(SO_(4))_(2).12H_(2)O`C. `NH_(4)Fe(SO_(4))_(2).12H_(2)O`D. `FeSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` |
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Answer» Correct Answer - D Alums are double salts of the general formula `H_(2)SO_(4) . R_(2)(SO_(4))_(3) . 24H_(2)O` where `M` is a univalent ion such as `Na^(+) , K^(+)`, or `NH_(4)^(+)` and `R` is a trivalent ion such as `Al^(3+)` or `Cr^(3+)` . On the other hand, pseudo alum has the general formula `MSO_(4) . R_(2)(SO_(4))_(3) . 24H_(2)O` where `M` is a divalent ion such as `Fe^(2+)`. Therefore, `FeSO_(4) . Al_(2)(SO_(4))_(3) . 24H_(2)O` is a pseudo alum. |
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