> Chemistry true false questions?

Chemistry true false questions?

Posted at: 2014-06-09 
I have already answered these questions I just want to compare and get feedback as to why it is wrong if it is: 1. Chromium metal can dissolve in dilute HCL I answered True because it ionizes in H+ 2. Iron metal will reduce Fe^3+ to Fe^2+ I answered False because it goes to Fe^2+(aq) 3. Silver metal will dissolve in nitric acid, liberating H2 gas I answered False because it goes to Ag(s) 4. Oxygen in moist air can oxidize Fe^2+ to Fe^3+ I answered False because oxidizing would reduce, not add 5. Mercury metal will dissolve in HNO3, but not in HCl. I answered True because it will not ionize 6. Tin metal will reduce Co^2+, but not Sn^4+. I answered F because Co^2+ is more stable