1.

A double salt which contains fourth period alkali metal (A) on heating at 500K gives (B). Aqueous solution of (B) gives a red colour compound with alizarin. Identify A and B.

Answer»

Solution :(i) A double SALT which contains `4^("th")` period alkali METAL (A) is
`K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`
(ii) `K_(2)SO_(4)Al_(2)(SO_(4))_(3).24H_(2)O overset(500K)to K_(2)SO_(4)Al_(2)(SO_(4))_(3)+24H_(2)O`
(iii) `:.` B is `K_(2)SO_(4).Al_(2)(SO_(4))_(3)`. This gives white PRECIPITATE with `BaCl_(2)`.
(iv) `K_(2)SO_(4).Al_(2)(SO_(4))_(3)` gives red colour with Alizarin.
(v) `A-K_(2)SO_(4).Al_(2)(SO_(4))_(3)24H_(2)O`
`B-K_(2)SO_(4).Al_(2)(SO_(4))_(3)`.


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