Question

High purity (>99.95%) dihydrogen is obtained by electrolyzing warm aqueous ________ hydroxide solution between nickel electrodes.
A.Magnesium
B.Barium
C.Calcium
D.Sodium

Answer 1

In the given question we have to find out that what is the process through which we can obtain the pure hydrogen gas and then we can elaborate the process to get the right answer for the given problem. On further analysis we will see that the hydroxide used is the barium hydroxide due to its nature of divalency and many others.

Complete step by step answer:
Here we have to explain the process through which the obtaining of pure hydrogen gas in the diatomic form exists.
Now, we get that the pure form of hydrogen gas is usually prepared by the process of electrolysis of the warm solution of the hydroxide compound of barium hydroxide. This is done using either one of platinum or nickel electrodes. This is important because we know that water does not conduct electricity very well, therefore it increases the chances that it is usual to electrolyse aqueous solution of barium hydroxide.
Now we get that the gases produced at the anode and cathode compartment need to be kept separate. Following reactions occur at anode and cathode.
Therefore the hydroxide used for the purpose is the $Ba{\left( {OH} \right)_2}$ which is barium hydroxide, and the element would be barium.
Therefore we can say that the right option would be option B, Barium.

Note:
Barium hydroxide is a chemical compound with the chemical formula of $Ba{\left( {OH} \right)_2}{({H_2}O)_x}$ . Whereas we can say that the monohydrate form of the compound is popularly known as baryta or baryta-water, is one of the principal compounds of barium. This white granular monohydrate is the usual commercial form.