Electrodes are immersed in water and electric current is passed through it. Which of the following statements is correct?
Oxygen bubbles will be formed at the electrode which is connected to the negative terminal of the battery
Hydrogen gas will be formed at the electrode which is connected to the positive terminal of the battery
No gas is formed at any electrode
Hydrogen gas will be formed at the electrode which is connected to the negative terminal of the battery
In the process of purification of copper metal, a thin plate of pure copper and a thick rod of impure copper are used as electrodes, and a metal salt solution is used as an electrolyte : (a) Which electrode is connected to the positive terminal of the battery ? (b) Which electrode is connected to the negative terminal of the battery ? (c) Which metal salt solution is taken as electrolyte ?