Integrated Science

Question 1

1An acid reacts with a base to form

Easy

A. only hydrogen gas B. an oxide and oxygen C. a salt and water D. a metal and acid

Question 2

2Which of these is a base used in the home?

Easy

A. orange juice B. vinegar C. baking soda D. lemon juice

Question 3

3Indigestion tablets often contain a mild base because

Easy

A. they add acid to the stomach B. they increase the pH of blood to 14 C. they neutralise excess stomach acid D. they kill all bacteria

Question 4

4An ant sting can be soothed with a mild base because the sting contains

Easy

A. an acid B. a salt C. a base D. sugar

Question 5

5Lemon juice is

Easy

A. alkaline B. acidic C. neutral D. a salt

Question 6

6Blue litmus paper turns red in

Easy

A. pure water B. salt solution C. a base D. an acid

Question 7

7Which pair of substances would produce a salt and carbon dioxide?

Hard

A. an acid and a carbonate B. two salts C. an acid and a metal D. a base and water

Question 8

8The pH of a solution with [H⁺] = 10⁻⁴ mol/dm³ is

Hard

A. 10 B. 0.0001 C. 4 D. −4

Question 9

9A base that dissolves in water is called an

Easy

A. alkali B. salt C. acid D. oxide only

Question 10

10A solution of pH 2 is

Hard

A. weakly acidic B. alkaline C. neutral D. strongly acidic