Chemistry

Question 1

1Diluting a strong acid of pH 2 by a factor of 100 gives a pH of

Hard

A. 2 B. 3 C. 6 D. 4

Question 2

2Pure water at 25 °C has a pH of

Easy

A. 7 B. 1 C. 14 D. 0

Question 3

3A buffer solution

Easy

A. changes colour with pH B. is a strong acid C. always has pH 7 D. resists changes in pH when small amounts of acid or base are added

Question 4

4Farmers add lime to soil that is

Easy

A. too acidic B. neutral C. too alkaline D. too sandy

Question 5

5The pH of a 0.001 mol/dm³ HCl solution is

Medium

A. 11 B. 0.001 C. 1 D. 3

Question 6

6A solution has a pOH of 4 at 25 °C. What is its pH?

Medium

A. 14 B. 4 C. 18 D. 10

Question 7

7The pH of 0.005 mol/dm³ H₂SO₄ (fully ionised) is

Hard

A. 2.3 B. 3 C. 1 D. 2

Question 8

8Universal indicator turns green in a

Easy

A. strong acid B. weak acid C. strong alkali D. neutral solution

Question 9

9A solution has [H⁺] = 1 × 10⁻³ mol/dm³. What is its pH?

Easy

A. 0.001 B. 11 C. −3 D. 3

Question 10

10The pH of 0.01 mol/dm³ NaOH at 25 °C is

Hard

A. 2 B. 12 C. 14 D. 10