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.
1, 2 and 3
1 only
1 and 3 only
3 only
For election to the Lok Sabha, a nomination paper can be filed by
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In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
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Which among the following events happened earliest ?
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An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
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