3. Many transition metals can form more than one simple positive ion. For example, iron forms both Fet2 and Fe*3 ions, and tin forms both Sn*2 and
Sn4 ions. Which is the smaller ion of each pair, and why?

Pl what kind of reaction is this? nahco3 + h2o → co2 + naoh + h2o -composition -decomposition -single replacement -double replacement im leaning more toward single replacement. if im wrong can you explain whyy?