1. A reaction occurs when an acid and an alkali are mixed.

2. What is used to decide when an acid and an alkali have neutralised each other?

a) A thermometer
b) An indicator
c) A colour change
d) A large temperature change

3. What colour does universal indicator turn in a neutral solution?

a) Green
b) Purple
c) Orange
d) Red

4. If too much acid is added to an alkaline solution how can it be neutralised?

a) By adding more acid
b) By adding more water
c) By adding more alkali
d) By adding more indicator

5. The products of a neutralisation reaction between an acid and an alkali are a solid and .

6. What is added to a salt solution to remove any indicator present?

a) Extra acid
b) Extra alkali
c) Powdered charcoal
d) Fine sand

7. How is a solid salt obtained from a salt solution?

a) By filtering
b) By cooling the solution
c) By adding a catalyst
d) By heating the solution

8. Match up the solutions and the colours they turn when a few drops of universal indicator is added to each of them.

9. A weak acid turn universal indicator yellow, what is the pH of this acidic solution?

a) 1
b) 6
c) 9
d) 12

10. Potassium hydroxide and sodium hydroxide are both strong alkalis, what colour will they turn when a few drops of universal indicator is added to their solutions?

a) Blue
b) Purple
c) Red
d) Yellow