Here are ten oxides: B₂O₃, Al₂O₃, In₂O₃, Tl₂O, CO, CO₂, SiO₂, GeO₂, SnO₂ and PbO₂…

Contributed by StemPy Lab

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Here are ten oxides: $\text{B}_{2}\text{O}_{3}$ , $\text{Al}_{2}\text{O}_{3}$ , $\text{In}_{2}\text{O}_{3}$ , $\text{Tl}_{2}\text{O}$ , CO, $\text{CO}_{2}$ , $\text{SiO}_{2}$ , $\text{GeO}_{2}$ , $\text{SnO}_{2}$ and $\text{PbO}_{2}$ . Use the trends of the two groups to say how many of them are acidic, how many amphoteric, how many basic and how many neutral.

Need a reminder? The key ideaShow

Count the oxides by their character: acidic, amphoteric, basic, neutral. Red lead forms by $6\text{PbO} + \text{O}_{2} \to 2\text{Pb}_{3}\text{O}_{4}$ and splits with nitric acid by $\text{Pb}_{3}\text{O}_{4} + 4\text{HNO}_{3} \to 2\text{Pb}(\text{NO}_{3})_{2} + \text{PbO}_{2} + 2\text{H}_{2}\text{O}$ . Carbides give gases with water: $\text{CaC}_{2}$ gives acetylene, one mole for each mole, and $\text{Al}_{4}\text{C}_{3}$ gives methane, three moles for each mole.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

← All Problems

← Lithium aluminium hydride is made by 4LiH + AlCl₃ → LiAlH₄ + 3LiCl…A sample of 100.0 g of lead(II) oxide (223.20 g/mol) is heated in air at about 750 K until it is… →

More onThe p-Block Elements › Groups 13 and 14: Boron and Carbon Families

Discussion (0)

Loading…