We're asked to identify which of the given elements: strontium, gold, tin, chlorine can be prepared by electrolysis of their aqueous salts.
Recall that Electrolysis will only occur if the standard reduction potential, E° is higher than that of water.
We will first determine the standard reduction potentials of the given elements and for water (values can be found in textbooks or online).
Identify those elements that can be prepared by electrolysis of their aqueous salts: strontium, gold, tin, chlorine.
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