GCSE Chemistry practice questions on acids, bases and oxides. Try 3 for free below — with hints, the answer and why the wrong answers are tempting. GCSE Beast has 20 questions on this topic.
Washing soda dissolves in water to give an alkaline solution. A student adds a few drops of litmus to one sample of the solution and a few drops of thymolphthalein to another sample.
Which row shows the colour of each indicator in the solution?
| litmus | thymolphthalein | |
|---|---|---|
| A | blue | blue |
| B | blue | pink |
| C | purple | blue |
| D | red | colourless |
A student tests four oxides, P, Q, R and S, with dilute hydrochloric acid and with warm aqueous sodium hydroxide.
| oxide | with dilute hydrochloric acid | with aqueous sodium hydroxide |
|---|---|---|
| P | reacts | no reaction |
| Q | reacts | reacts |
| R | no reaction | reacts |
| S | no reaction | no reaction |
Which row gives the type of oxide for P, Q and R?
| P | Q | R | |
|---|---|---|---|
| A | acidic | amphoteric | basic |
| B | basic | amphoteric | acidic |
| C | basic | basic | acidic |
| D | basic | neutral | acidic |
A student warms solid ammonium chloride in turn with two reagents and holds damp red litmus paper at the mouth of each test tube.
Which row shows the colour of the litmus paper in each test?
| test 1 | test 2 | |
|---|---|---|
| A | blue | blue |
| B | blue | red |
| C | red | blue |
| D | red | red |