1.

(a) What happens when acidified K_(2)Cr_(2)O_(7) is treated with : (i) H_(2)S (ii) KI (iii) FeSO_(4) (b) Write formula of : (1) Pyrolusite ore (ii) Chromite ore.

Answer»

Solution :(a) (i) `K_(2)Cr_(2)O_(7)+ 4H_(2)SO_(4)+ 3H_(2)S to K_(2)SO_(4)+ Cr_(2)(SO_(4))_(3)+7H_(2)O+ 3S`
(ii) `K_(2)Cr_(2)O_(7)+ 7H_(2)SO_(4)+ 6KI to 4K_(2)SO_(4)+Cr_(2)(SO_(4))_(3)+ 3I_(2)+7H_(2)O`
(iii) `K_(2)Cr_(2)O_(7)+ 7H_(2)SO_(4)+ 6FeSO_(4) toK_(2)SO_(4)+ Cr_(2)(SO_(4))_(3)+ Fe_(2)(SO_(4))_(3)+2H_(2)O`
(b) (i) `MnO_(2)` (ii) `FeO. Cr_(2)O_(3)`. or `FeCr_(2)O_(4)`


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