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Q49) On oxidation with iodine sulphite ion is transformed to ... [ CPMT 1992]




SOLUTION

I2 being a weak oxidising agent, oxidises SO32- to SO42-
Answer: (c)


Q50) A solution of potassium bromide is treated with each of the following. Which one would liberate bromine? [ CBSE PMT 1993]




SOLUTION

2KBr + Cl2 → 2KCl + Br2
Cl2 is strong oxidising agent displaces weak oxidizing agent Br2 from it salt form
Answer: (c)


Q51) Which of the following pairs will give chlorine gas most quickly, upon reaction? [ DEC 1994]



SOLUTION

Con HCl reacts with KMnO4 solution most readily and gives Cl2 gas
2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 5Cl2 +8H2O
Answer:(a)



Q52) In the reaction
3Br2 + 6CO32- + 3H2O → 5Br- + BrO3- + 6HCO3-



SOLUTION

Bromine is reduced from 0 to -1 in Br- and oxidised to +5 in BrO3-
Answer: (b)


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