The electrolysis of concentrated hydrochloric acid with platinum electrodes is shown. What is seen at each electrode at the beginning of the electrolysis?
- Apositive electrode: colourless gas; negative electrode: colourless gas
- Bpositive electrode: colourless gas; negative electrode: green gas
- Cpositive electrode: green gas; negative electrode: colourless gas
- Dpositive electrode: green gas; negative electrode: green gas