Which of the following reactions is an oxidation…?

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Which of the following reactions is an oxidation process?

QUICK ANSWER…

B

SOLUTION…  

Oxidation involves the loss of electrons; we are simply required to identify which of the reactions involves the loss of electron.

Now, when electron is lost, a neutral atom will become positively charged, and

A negatively charged ion will become neutral, this is why oxidation is used to liberate non-metals at the anode of an electrolytic cell.

Now for the right answer to the above question:

1. Option A is incorrect. positively charged hydrogen ion gained electron to become neutral.
2. Option B is correct. Negatively charged oxygen ion losses electrons to become neutral diatom.
3. C is incorrect. neutral water molecule gained electrons to become negatively charged hydroxide ion.
4. D is not the correct answer. Neutral chlorine gained electron to become negatively charged chloride ion.

KEY-POINTS…

You may please note these/this:

• Oxidation involves the loss and not the gain of electron(s).
• When a neutral atom losses electron(s), it becomes positively charged.
• When a negatively charged ion losses electron, it becomes neutral as shown in option B.

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/culled from 2019 JAMB-UTME Chemistry question 25/