Which of the following statements about hydrogen is /are correct? 1. Hydrogen has three isotopes of which protium is the most common. 2. Hydrogen ion (H+) exists freely in solution. 3. Dihydrogen, H2, acts as a reducing agent. Select the correct answer us

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Q: 45 (NDA-I/2014)

Which of the following statements about hydrogen is /are correct?
1. Hydrogen has three isotopes of which protium is the most common.
2. Hydrogen ion (H+) exists freely in solution.
3. Dihydrogen, H2, acts as a reducing agent.
Select the correct answer using the code given below.

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,6,20,15,2,6,3

keywords: 

{'hydrogen ion': [0, 0, 0, 1], 'hydrogen': [0, 0, 1, 3], 'isotopes': [0, 0, 3, 6], 'h2': [0, 0, 4, 4], 'protium': [0, 0, 0, 1], 'dihydrogen': [0, 0, 0, 1]}

Option 1 states that hydrogen has three isotopes, with protium being the most common. This statement is correct. Hydrogen does indeed have three isotopes - protium, deuterium, and tritium. Protium is the most common and forms about 99.98% of naturally occurring hydrogen.

Option 2 states that the hydrogen ion (H+) exists freely in solution. This statement is incorrect. The hydrogen ion, H+, is a positively charged particle and does exist in solution, but it does not exist freely. It is usually attached to an anion or is bonded with other molecules.

Option 3 states that dihydrogen, H2, acts as a reducing agent. This statement is correct. Dihydrogen gas (H2) can act as a reducing agent as it readily donates its electrons to oxidizing agents, thereby causing reduction in the other substances.

Therefore, the correct answer is option 3: 1 and 3 only. Alert - correct answer should be option 1: 1, 2 and 3.