A technician passes a direct electric current through sodium nitrate solution using graphite electrodes.
Name the product released at the positive electrode.
Give one reason why this product forms.
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.