Option D. The electrolysis of brine produces chlorine gas, sodium hydroxide, and hydrogen gas.
Explanation:
Brine is a solution sodium chloride and water. Electrolysis is a process in which a chemical solution is put under an electric current in order to produce chemical changes and bring a new chemical solution as a result. Industries use electrolysis of brine in a large scale in order to produce chlorine from salt, but chlorine gas is not the only product of the electrolysis of brine, as this process also makes sodium hydroxide and hydrogen gas.
The atomic radius of strontium is larger than magnesium because there are more number of shielding electrones in strontium than magnesium, which causes electron-electron repulsion, that makes the electrons in valance shell to expand. Hence it would decrease the effective nuclear charge.