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If 20cm³ of H2 was liberated at the cathode during the electrolysis of dilute tetraoxosulphate...

If 20cm³ of H2 was liberated at the cathode during the electrolysis of dilute tetraoxosulphate (VI) acid, what volume of O2 would be liberated at the anode
(a) 5cm³
(b) 10cm³
(c) 20cm³
(d) 40cm³?

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