Double sulphates of a divalent and trivalent metal crystallised with 24 molecules of water of crystallisation are called pseudoalums and are not isomorphous with true alums. Which of them is//are pseudoalums ?

Double sulphates of a divalent and trivalent metal crystallised with 2

1.	Double sulphates of a divalent and trivalent metal crystallised with 24 molecules of water of crystallisation are called pseudoalums and are not isomorphous with true alums. Which of them is//are pseudoalums ?
Answer» `MnSO_(4). Al_(2)(SO_(4))_(3). 24H_(2) O` `FeSO_(4).Al_(2)(SO_(4))_(3) .24 H_(2) O` `ZnSO_(4).Al_(2)(SO_(4))_(3). 24 H_(2) O` `CaSO_(4). Al_(2)(SO_(4))_(3). 24 H_(2) O` ANSWER :A::B