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CBSE Class 12-science Answered

An aqueous solution of an inorganic compund X shows the following reactions (i) It decolorises an acdified KMNO4 solution with the evolution of O2. (ii) It liberates iodine from an acidified KI solution. (iii) It gives brown ppt with alkaline KMNO4 solution with the evolution of O2. (iv) It removes black stains from oil paintings. Identify X and give equations.
Asked by lekhakarthikeyan | 28 Aug, 2018, 03:58: AM
answered-by-expert Expert Answer
X = H2O2
 
(i) It decolorizes an acidified KMnO4 solution with the evolution of O2.
 
2 KMnO subscript 4 space end subscript plus space 3 straight H subscript 2 SO subscript 4 space plus space 5 straight H subscript 2 straight O subscript 2 space rightwards arrow with blank on top space straight K subscript 2 SO subscript 4 space plus space 2 MnSO subscript 4 space plus space 8 straight H subscript 2 straight O space plus space 5 straight O subscript 2
 
 
(ii) It liberates iodine from an acidified KI solution.
 
2 KI space plus space straight H subscript 2 SO subscript 4 plus space straight H subscript 2 straight O subscript 2 space rightwards arrow straight K subscript 2 SO subscript 4 space plus space straight I subscript 2 space plus space 2 straight H subscript 2 straight O
 
(iii) It gives brown ppt with the alkaline KMnO4 solution with the evolution of O2.
 
2 KMnO subscript 4 space plus space 3 straight H subscript 2 straight O subscript 2 space space rightwards arrow 2 space MnO subscript 2 space plus space 2 straight H subscript 2 straight O space plus space 3 straight O subscript 2 plus space 2 KOH
 
(iv) It removes black stains from oil paintings.
 
PbS space plus space 4 straight H subscript 2 straight O subscript 2 space rightwards arrow PbSO subscript 4 space plus space 4 straight H subscript 2 straight O Black space space space space space space space space space space space space space space space space space space space White
Answered by Ramandeep | 29 Aug, 2018, 12:22: PM

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CBSE 12-science - Chemistry
An aqueous solution of an inorganic compund X shows the following reactions (i) It decolorises an acdified KMNO4 solution with the evolution of O2. (ii) It liberates iodine from an acidified KI solution. (iii) It gives brown ppt with alkaline KMNO4 solution with the evolution of O2. (iv) It removes black stains from oil paintings. Identify X and give equations.
Asked by lekhakarthikeyan | 28 Aug, 2018, 03:58: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
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