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Describe the oxidising action of potassium di chromate in H_2SO_4 solution with the following- (i) H_2S (ii) Na_2S_2O_3 (iii) NaCl |
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Answer» Solution :In acidic medium `K_2Cr_2O_7` acts as a strong OXIDISING AGENT. (i) `K_2Cr_2O_7` reacts with `H_2S` and oxidises it to SULPHUR (S)  (ii)`K_2Cr_2O_7` oxidising `(S_2O_3^(2-))` to sulphate `(SO_4^(2-))` salt.  (iii) When NaCl react with `K_2Cr_2O_7` in acidic solution, VAPOURS of chromyl CHLORIDE are formed. 
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