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The chemical reaction of K(2)Cr(2) O(7) ...

The chemical reaction of `K_(2)Cr_(2) O_(7)` with following:
(i) `H_(2)SO_(4) " " (ii) KOH " " (iii) KI`.
(b) What is chromly chloride test ?

Text Solution

Verified by Experts

`2K_(2)Cr_(2)O_(7)+8H_(2)SO_(4) overset(Delta)to2K_(2)SO_(4) +2Cr_(2)(SO_(4))_(3)+8H_(2)O+3O_(2)`
`K_(2)Cr_(2)O_(7)+2KOH) to 2K_(2)CrO_(4)+H_(2)O`
(iii) `K_(2)Cr_(2)O_(7)+7H_(2)SO_(2)+5HI to 4K_(2)SO_(4)+cr_(2)(SO_(4))_(3)+7I_(2)+7H_(2)O`
(b) When heated with conc. HC or with a soluble chloride and conc. H2SO4 reddish brown vapour of chromyl chloride are produced.
`K_(2)Cr_(2)O_(7)+4KCl+ underset((Conc))(6H_(2)SO_(4)) overset(Delta)to underset("Chromyl Chloride")(2CrO_(2)Cl_(2))+6KSHO_(4)+3H_(2)O`
This reaction is used as a test for soluble chlorides and is called chromyl chloride test.
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