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10 questions from this quiz
S4O62−\text{S}_4\text{O}_6^{2-}S4O62−
1 mol ClO−\text{ClO}^-ClO− ≡ 2 mol S2O32−\text{S}_2\text{O}_3^{2-}S2O32−
When solution becomes pale straw colour
Colourless
1 mol Cu2+\text{Cu}^{2+}Cu2+ ≡ 1 mol S2O32−\text{S}_2\text{O}_3^{2-}S2O32−
Copper content in brass alloys
To provide H+\text{H}^+H+ ions for the reaction
Deep blue-black
White copper(I) iodide (CuI)
It must oxidise I−\text{I}^-I− to I2\text{I}_2I2
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