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22. It is observed that a solid mixture of chloride salt andpotassium dichromate is heated with con.H2SO4 red vapoursare formed. When these vapours are passed into aqueous caustic soda solutionyellow solution is formed. This on further treatment with lead acetatesolution, a yellow precipitate is formed.a) Whatis significance of the sequence of reactions?b) Whatis the name and formula of the red vapours?c) Whyred vapours are changed to yellow solution? And write its formulad) Whatis the yellow precipitate formed in the last step and its formula?e) Writethe related chemical equations for above chemical changes.

Bharani VLSVSS · Accepted Answer

Ans.a) The above reactions refer to chromyl chloride test for the detection of the presence of chloride ion.b) The name of the red vapours is CHROMYL CHLORIDE and their formula is CrO2Cl2.c) On passing chromyl chloride through caustic soda, sodium chromate is formed which is yellow in colour.Its formula is Na2CrO4.d) The yellow precipitate is Lead chromate. Its formula is PbCrO4.e) KCl + K2Cr2O7 + H2SO4 -->CrO2Cl2 + K2SO4CrO2Cl2 + NaOH --> Na2CrO4 + H2ONa2CrO4 + Pb(CH3COO)2 --> PbCrO4 + CH3COONa

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Physical Chemistry> need help...

iit jee , 13 Years ago

Bharani VLSVSS

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