Exams › JEE Advanced › Chemistry
Which of the following combinations will liberate hydrogen gas?
- Zn metal and NaOH(aq)
- Au metal and NaCN(aq) in the presence of air
- Cu metal and conc. HNO3
- Fe metal and conc. HNO3
Correct answer: Zn metal and NaOH(aq)
Solution
Zinc, being amphoteric, dissolves in NaOH to form sodium zincate and evolves H2 gas.
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