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CGP EDU Academic Team
Published on: August 14, 2026
Ni + H 2 SO 4 (hot and concentrated) 
X(g).
The liberated gas (select the correct statement(s)) :
Text Solution
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(a,b,d)
5SO 2 + 2IO 3 – + 4H 2 O 
I 2 + 5SO 4 2– + 8H + ; I 2 + starch 
blue colour.
2H + + 3SO 2 + Cr 2 O 7 2– 
2Cr 3+ (green ) + 3SO 4 2– + H 2 O
Pb 2+ + SO 3 2– 
PbSO 3 ↓ (white)
SO 2 + 2H 2 O + Cl 2 
H 2 SO 4 + HCl
HCl + NH 3 
NH 4 Cl
Ni + H 2 SO 4 + 2H + 
Ni 2+ + SO 2 [X] + 2H 2 O
With dilute H 2 SO 4 , hydrogen gas is liberated.
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