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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.

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






 
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