CIE iGCSE Co-Ordinated Science C7.1 The characteristic properties of acids and bases Exam Style Questions Paper 1
Question
Which substances neutralise acids?
1 lime
2 limestone
3 calcium hydroxide
A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
▶️Answer/Explanation
Ans :B
Question
When aqueous potassium hydroxide is warmed with ammonium chloride, a gas is given off.
Which test result identifies the gas?
A It bleaches pH paper.
B It turns anhydrous cobalt(II) chloride blue.
C It turns universal indicator red.
D It turns red litmus blue.
▶️Answer/Explanation
Ans :A
Question
A metal oxide powder is added to a dilute acid.
The initial temperature of the acid is 21 ºC. The pH of the acid is 2.
When all the acid has reacted, the temperature of the reaction mixture is 23 ºC and the pH is 7.
Which statement describes this reaction?
(A) It is endothermic and neutralisation.
(B) It is endothermic and oxidation.
(C) It is exothermic and neutralisation
(D) It is exothermic and oxidation.
▶️Answer/Explanation
Ans: C
Question
Indigestion is caused by excess hydrochloric acid in the stomach.
Which substance can be used to neutralise the acid?
▶️Answer/Explanation
Ans: D