Which of the following evolve hydrogen on reacting with cold dilute nitric acid ?

Which of the following evolve hydrogen on reacting with cold nilute nitric acid ?

How does iron react with dilute nitric acid ?

Metals like copper fail to evolve hydrogen gas on reacting with dilute nitric acid.

Which of the following metal does not evolve hydrogen gas on reaction with dilute HCl?

(a) Can combination reaction be an oxidation reaction ? (b) How will you test whether the gas evolved in a reaction is hydrogen ? (c) Why does copper not evolve hydrogen on reacting with dilute sulphuric acid ?