Which of the following combination will produce H2 gas ?
Which of the following combination will produce H2 gas ?
Option 1 - <p>Zn metal and NaOH(aq)<br><!-- [if !supportLineBreakNewLine]--><br><!--[endif]--></p>
Option 2 - <p>Au metal and NaCN(aq) in the presence of air<br><!-- [if !supportLineBreakNewLine]--><br><!--[endif]--></p>
Option 3 - <p>Cu metal and conc. HNO₃</p>
Option 4 - <p>Fe metal and conc. HNO₃</p>
2 Views|Posted 5 months ago
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5 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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Chemistry Ncert Solutions Class 11th 2023
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