Which of the following is a redox reaction? (2019)

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Question: Which of the following is a redox reaction? (2019)

Options:

Correct Answer: 2H2 + O2 → 2H2O

Exam Year: 2019

Solution:

In the reaction 2H2 + O2 → 2H2O, hydrogen is oxidized and oxygen is reduced, making it a redox reaction.

Which of the following is a redox reaction? (2019)

Which of the following is a redox reaction? (2019)

Step 1: Identify the reactants in the reaction. Here, the reactants are 2H2 (hydrogen) and O2 (oxygen).
Step 2: Determine what happens to hydrogen in the reaction. Hydrogen (H2) combines with oxygen to form water (H2O).
Step 3: Understand oxidation. Oxidation is when a substance loses electrons. In this case, hydrogen is losing electrons as it combines with oxygen.
Step 4: Determine what happens to oxygen in the reaction. Oxygen (O2) combines with hydrogen to form water (H2O).
Step 5: Understand reduction. Reduction is when a substance gains electrons. Here, oxygen is gaining electrons as it combines with hydrogen.
Step 6: Conclude that since hydrogen is oxidized (loses electrons) and oxygen is reduced (gains electrons), this reaction is a redox reaction.

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