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Which of the following combination will produce H2 gas ?

Option 1 -

Zn metal and NaOH(aq)

Option 2 -

Au metal and NaCN(aq) in the presence of air

Option 3 -

Cu metal and conc. HNO₃

Option 4 -

Fe metal and conc. HNO₃

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    2 months ago
    Correct Option - 1


    Detailed Solution:

    i. Zn + 2NaOH → Na? ZnO? + H?
    ii. 4Au + 8NaCN + O? + 2H? O → 4Na [Au (CN)? ]+ 4NaOH
    iii. Cu + 4HNO? → Cu (NO? )? + 2NO? + 2H? O
    (conc.)

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