What are alums? Give the chemcial formulae of the following alums:

1.	What are alums? Give the chemcial formulae of the following alums:
Answer» Alums are the special type of double salts of certain compounds with the general formula `M_(2)SO_(4)M_(2)(SO_(4))24H_(2)O` Here M: monovalent cation link `Na^(+) ,K^(+),Rb^(+),NH_(4)^(+)` M: trivalent cation like `Al^(3+),Fe^(3+)` or `Cr^(3+)`. Potash alum : `K_(2)SO_(4),Al_(2)(SO _(4)) _(3) .24 H_(2)O` Ferric alum: `(NH_(4))_(2)SO_(4).Fe_(2)(SO_(4))_(3).24H_(2)O` Chrome alum : `K_(2)SO_(4)Cr_(2)(SO_(4))_(3).24 H_(2)O`.

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In which following statement are correct. (a) Anhydrous hydrogen fluroide is a liquid at ordianry temperature while other halogen acid are gases. (b) Lead acetate does not form any precipitate with HF acid but other halogen acid from precipitates. (c) HF is heated with a mixture of `MnO_2` and `H_2SO_4`, no gas is evolved but In case of HCI, HBr and HI acids evolved gases. (d) HF is not oxidised by strong oxidising agent but other halogen acid are oxidised.A. (A) aB. (B) bC. (C) cD. d
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What are alums? Give the chemcial formulae of the following alums:

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