1(iv)
The following statements are related to the properties of sulphuric acid:
- Barium chloride reacts with sulphuric acid to give a white precipitate.
- Sulphur dioxide gas is evolved when sulphuric acid reacts with carbon.
- Sulphuric acid has a pH value of less than 7.0.
- Copper (II) oxide reacts with sulphuric acid to form a blue solution.
Which two statements confirm the acidic nature of sulphuric acid?
- (a)1 and 2
- (b)1 and 3
- (c)3 and 4
- (d)2 and 4
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3 and 4
Reason — An acid has a pH value less than 7 (statement 3) and reacts with a basic oxide like copper(II) oxide to form a salt and water (statement 4). Statement 1 is only a test for the sulphate ion and statement 2 shows the oxidising property of sulphuric acid.