Analytical ChemistryHard
Question
An inorganic compound ′A′ is dissolved in dilute hydrochloric acid and is then warmed. A colourless gas ′B′ is produced. When a filter paper moistened with potassium iodate and the starch solution is exposed to the gas it turns blue. The gas B and the compound A are :
Options
A.SO2 and Na2SO3
B.SO3 and Na2SO4
C.H2S and Na2S
D.H2S and Na2SO3
Solution
SO32- + 2H+ → SO2 ↑ + H2O
SO2 + 2IO3- + 4H2O → I2 + 5SO4-2 + 8H+
Thus the gas B and compound A are SO2 and Na2SO3 respectively.
SO2 + 2IO3- + 4H2O → I2 + 5SO4-2 + 8H+
Thus the gas B and compound A are SO2 and Na2SO3 respectively.
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