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     EduGorilla 
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    Directions: This question has FOUR options [1], [2], [3] and [4]. ONLY ONE among these four options is correct.

    Which of the following combinations will produce H2 gas?

    Options :-

    1. Fe metal and conc. HNO3
    2. Cu metal and conc. HNO3
    3. Au metal and NaCN (aq) in the presence of air
    4. Zn metal and NaOH (aq)
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Reply To: Directions: This question has FOUR options [1], [2], [3] and [4]. ONLY ONE among these four options ….
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