Question

Hydrogen can be obtained economically as a bi-product in the electrolysis of _____________.
Calcium chloride
water
Sodium hydroxide
brine

Answer 1

Can you write out the chemical formulas for each?

Answer 2

CaCl2
H2O
NaOH

Answer 3

CaCl2 will for sure not produce Hydrogen.
I think 2H2O will produce 2H2 + O2.

Answer 4

My reasoning is, The H2 and O2 is stable.
However, in NaOH The Na has a positive charge and the OH has a negative charge (hence , it remains neutral). If 2OH for O2 + H2 The Na won't have anything to maintain it's neutrality.