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_year: 
2014
question_exam: 
NDA-I
stats: 
0,200,456,280,104,200,72