Question

1

The electrolysis of a concentrated sodium chloride solution would produce

	sodium metal at the cathode
	sodium metal at the anode
	hydrogen gas at the cathode
	chlorine gas at the cathode

2

A student fills one small vessel with 1.0 M Cu²⁺ and another with 0.10 M Zn²⁺. A piece of filter paper saturated with sodium sulfate is used for a salt bridge. A copper electrode is placed in the Cu²⁺ side and zinc electrode in the Zn²⁺ side. When the student measures the voltage, what should be the result?

	no reading because the electrodes were reversed
	higher than the calculated standard reduction potential difference
	a lower voltage since the Cu2+ is more concentrated than the Zn2+
	no reading because the wrong chemicals were used in the salt bridge

3

When a battery is "dead", the following explanation makes the most sense:

	the reaction rate is too slow
	there are no more electrons present
	reactants have all changed into products
	the equilibrium is beginning to go in reverse

Answer 1

Ans 1 : hydrogen gas at the cathode

Electrolysis is a process in which the compound undergoes breakdown in the presence of electric current. So when a solution of concentrated sodium chloride undergoes electrolysis , it produces chlorine at anode , and sodium hydroxide and hydrogen is produced at cathode.