Are the following True or False? If false, explain why. (I put what I think the answers are below each question)

Question

1) Iron metal will reduce Fe3+ to Fe2+
(False because Fe3+ is more stable than Fe2+?)
2) Copper metal will dissolve in nitric acid, liberating NO gas
(True)
3) Oxygen in moist air can oxidize I- to I2
(True)
4) Silver metal will dissolve in HNO3 but not HCl
(True)
5)Gold may be dissolved in 1M HNO3
(False because gold is a strong oxidizing agent, stronger than HNO3)