Analytical ChemistryHard
Question
An inorganic salt when heated with concentrated H2SO4 evolves a colourless pungent smelling gas but with concentrated H2SO4 and MnO2 evolves a coloured pungent smelling gas which bleaches moist litmus paper. The coloured gas is :
Options
A.NO2
B.Cl2
C.Br2
D.I2
Solution
Cl- + H2SO4 → HCl ↑ (colourless) + HSO4-
MnO(OH)2 + 2H2SO4 + 2Cl- → Mn2+ + Cl2 ↑ (yellowish green) + 2SO42- + 3H2O
Cl2 + H2O → 2HCl + [O]
Litmus + [O] → colourless oxidised form
Cl2 is a yellowish green gas which bleaches litmus paper by oxidation.
MnO(OH)2 + 2H2SO4 + 2Cl- → Mn2+ + Cl2 ↑ (yellowish green) + 2SO42- + 3H2O
Cl2 + H2O → 2HCl + [O]
Litmus + [O] → colourless oxidised form
Cl2 is a yellowish green gas which bleaches litmus paper by oxidation.
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