Question

Which changes occur when Pt2+ is reduced? A) The Pt2+ gains electrons and its oxidation number increases. B) The Pt2+ gains electrons and its oxidation number decreases. C) The Pt2+ loses electrons and its oxidation number increases. D) The Pt2+ loses electrons and its oxidation number decreases.

Answer 1

When Pt2+ is reduced, it gains electrons, which causes a decrease in its oxidation number, making option B the correct answer.

Step-by-step explanation:

When Pt2+ is reduced, it gains electrons and its oxidation number decreases. During a redox reaction, an element or ion that is reduced will undergo a decrease in oxidation number as it gains electrons. Therefore, option B) The Pt2+ gains electrons and its oxidation number decreases is correct.