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General — Easy JEE chemistry MCQ

Which of the following combination will produce $\mathrm{H}_{2}$ gas?
  1. A. Fe metal and conc. $\mathrm{HNO}_{3}$
  2. B. Cu metal and conc. $\mathrm{HNO}_{3}$
  3. C. $\mathrm{Zn}$ metal and $\mathrm{NaOH}(\mathrm{aq})$
  4. D. Au metal and $\mathrm{NaCN}(\mathrm{aq})$ in the presence of air

Solution

The correct option is **C**.

CHEMISTRY

easy • PYQ Reworded
Question
Read carefully, then pick the best option.
Which of the following combination will produce H2\mathrm{H}_{2} gas?
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General — Easy JEE Chemistry MCQ | MyGoalPrep