Answer:

All of these

Explanation:

I think there is no need of explanation

Very easy

Answer:

Answer is c) HNO3

Explanation:

Because HNO3 is a strong oxidizing agent. it oxidises H2 produced to water and itself gets reduced to any of nitrogen oxides.

Exception are Mg and Mn which react with very dilute HNO3 to form to evolve H2 gases