Analytical ChemistryHard
Question
Ni + H2SO4 (hot and concentrated) → X(g).
The liberated gas (select the correct statement) :
The liberated gas (select the correct statement) :
Options
A.develops blue colour spots on the filter paper moistened with potassium iodate and starch solution.
B.turns acidified K2Cr2O7 solution green.
C.produces black precipitate with lead acetate solution.
D.reacts with Cl2 water to produce an acid which gives white fumes with ammonia.
Solution
(A) 5SO2 + 2IO3- + 4H2O → I2 + 5SO42- + 8H+ ; I2 + starch → blue colour.
(B) 2H+ + 3SO2 + Cr2O72- → 2Cr3+ (green ) + 3SO42- + H2O
(C) Pb2+ + SO32- → PbSO3 ↓ (white)
(D) SO2 + 2H2O + Cl2 → H2SO4 + HCl
HCl + NH3 → NH4Cl
Ni + H2SO4 + 2H+ → Ni2+ + SO2 ↑ [X] + 2H2O
With dilute H2SO4, hydrogen gas is liberated.
(B) 2H+ + 3SO2 + Cr2O72- → 2Cr3+ (green ) + 3SO42- + H2O
(C) Pb2+ + SO32- → PbSO3 ↓ (white)
(D) SO2 + 2H2O + Cl2 → H2SO4 + HCl
HCl + NH3 → NH4Cl
Ni + H2SO4 + 2H+ → Ni2+ + SO2 ↑ [X] + 2H2O
With dilute H2SO4, hydrogen gas is liberated.
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