Question

Which changes occur when Pt2+ is reduced?
(1) The Pt2+ gains electrons and its oxidation number increases.
(2) The Pt2+ gains electrons and its oxidation number decreases.
(3) The Pt2+ loses electrons and its oxidation number increases.
(4) The Pt2+ loses electrons and its oxidation number decreases.

Answer 1

Answer: Option (2) is the correct answer.

Explanation:

When an element or compound gain electrons then this means the element is undergoing reduction.

Also, in reduction oxidation number of the element decreases.

For example, $Pt^{2+} + 1e^{-} \rightarrow Pt^{+1}$

Thus, we can conclude that the $Pt^{2+}$ gains electrons and its oxidation number decreases.

Answer 2

The $Pt^{+2}$  gains electrons and its oxidation number decreases. Hence, option B is correct.

What is a redox reaction?

A chemical reaction that takes place between an oxidizing substance and a reducing substance.

When an element or compound gain electrons then this means the element is undergoing reduction.

For example, $Pt^+ +1e^-$ → $Pt^+$

Thus, we can conclude that the gains electrons and its oxidation number decreases.

Hence, option B is correct.

Learn more about the redox reaction here:

https://brainly.com/question/13293425

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