1
Q
Na2CO3 with K2Cr2O7
A
Green Solution of Cr3+ formed
2
Q
Colour of CuSO4
A
Blue
3
Q
MnO2 was reduced to Mn2+
A
as seen by the off-white/light brown ppt formed with NaOH(aq) that darkened on standing. [
4
Q
Oxidising agent
A
Since a brown/orange/yellow solution is formed that decolourises with S2O32−, I− was oxidised to I2
H2 Chemistry
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