In which of the following reaction hydrogen acts as oxidizing agent.
Correct answer: C. 2Na + H2 --> 2NaH
- A. H2 + Cl2 --> 2HCl
- B. C2H4 + H2 --> C2H6
- C. 2Na + H2 --> 2NaH
- D. N2 + 3H2 --> 2NH3
Explanation
In the correct reaction, 2Na + H2 --> 2NaH, sodium (Na) is oxidized, as it loses electrons to form Na+, while hydrogen (H2) is reduced to form H−. Therefore, in this reaction, H2 acts as an oxidizing agent by gaining electrons. In the other reactions, H2 is either oxidized or acts as a reducing agent.
Last updated
About Oxidation and Reduction
Oxidation involves loss of electrons, increase in oxidation number or addition of oxygen, while reduction involves electron gain, decrease in oxidation number or removal of oxygen. The topic covers oxidising and reducing agents, oxidation-number changes, redox equations and the distinction between oxidation at the anode and reduction at the cathode.
Practise Electrochemistry
696 free Electrochemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
6NaOH + 3Cl2 ----> 5NaCl + NaClO3+3H2OIn the above disproportion reaction, the oxidation state of chlorine is changed from zero to _ and _.
A metallic atom loses its valence electron to form a/an _________?
An oxidising agent is a substance that
Apparent charge on atom in molecule is___________________?
Bosch Process involves _______?