3(ii)
The reactions of four different oxides W, X, Y and Z are given below:
- W reacts with hydrochloric acid, but not with sodium hydroxide.
- X reacts with both hydrochloric acid and sodium hydroxide.
- Y does not react with either hydrochloric acid or sodium hydroxide.
- Z reacts with sodium hydroxide, but not with hydrochloric acid.
From the information provided above, identify the oxide which is:
(a) amphoteric
(b) acidic
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(a) X — It reacts with both an acid (HCl) and a base (NaOH), which is the property of an amphoteric oxide.
(b) Z — It reacts with a base (NaOH) but not with an acid, which is the property of an acidic oxide.