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Which of the following combination will produce H 2 gas?

Options

  1. AFe metal and conc. H N O 3
  2. BCu metal and conc. H N O 3
  3. CAu metal and NaCN(aq) in the presence of air
  4. DZn metal and NaOH(aq)

Correct answer

D. Zn metal and NaOH(aq)

Step-by-step solution

F e + c o n c . H N O 3 → P a s s i v i t y C u + c o n c . H N O 3 → N O 2 A u + N a C N + O 2 → [ A u ( C N ) 2 ] - Z n + N a O H → N a 2 Z n O 2 + H 2

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