1. Question 1 of 25

   Washing soda is used to

   A Soften hard water B Make cakes rise C Whiten teeth D Preserve pickles
2. Question 2 of 25

   Chlorine is added to tap water mainly to

   A Kill disease-causing microbes B Add taste C Make water softer D Increase the pH
3. Question 3 of 25

   Lemon juice can remove limescale because it contains

   A Acetic acid B Citric acid C Lactic acid D Carbonic acid
4. Question 4 of 25

   Soap cleans oily dirt because its molecules

   A React with oil to make water B Are strong acids C Dissolve in grease only D Have a water-loving head and a grease-loving tail forming micelles
5. Question 5 of 25

   Bleaching powder, used to disinfect drinking water, is mainly

   A Calcium hypochlorite B Calcium carbonate C Sodium carbonate D Calcium sulphate
6. Question 6 of 25

   Baking soda is

   A Sodium carbonate B Sodium hydroxide C Sodium bicarbonate D Calcium carbonate
7. Question 7 of 25

   Drain cleaners often contain

   A Sodium chloride B Sodium hydroxide (caustic soda) C Calcium sulphate D Sodium bicarbonate
8. Question 8 of 25

   Vinegar contains about 5% of

   A Acetic acid B Citric acid C Hydrochloric acid D Sulphuric acid
9. Question 9 of 25

   Alum is used in water purification to

   A Add chlorine B Make suspended particles settle (coagulation) C Soften water D Add fluoride
10. Question 10 of 25

    Common salt is chemically

    A Sodium carbonate B Calcium chloride C Sodium chloride D Potassium nitrate
11. Question 11 of 25

    The gas released when vinegar reacts with baking soda is

    A Hydrogen B Oxygen C Chlorine D Carbon dioxide
12. Question 12 of 25

    Glycerine, used in soaps and lotions, is used as a

    A Fuel B Pesticide C Moisturiser D Acid
13. Question 13 of 25

    Naphthalene balls placed in clothes disappear gradually because of

    A Evaporation of water B Sublimation C Condensation D Combustion
14. Question 14 of 25

    Detergents are better than soaps in hard water because they

    A Are acidic B Are made from animal fat C Do not form insoluble scum with calcium and magnesium ions D Contain no cleaning molecules
15. Question 15 of 25

    Milk of magnesia is used as an antacid because it is

    A A strong acid B A salt of sodium C A vitamin D A mild base (magnesium hydroxide)
16. Question 16 of 25

    Household bleach is mainly a solution of

    A Sodium chloride B Sodium hypochlorite C Calcium carbonate D Sodium hydroxide
17. Question 17 of 25

    Baking powder is a mixture of baking soda and

    A A weak solid acid such as tartaric acid B Common salt C Washing soda D Caustic soda
18. Question 18 of 25

    Hydrogen peroxide (3%) is used as a

    A Strong acid B Fertiliser C Mild antiseptic and bleaching agent D Fuel
19. Question 19 of 25

    Toilet cleaners that remove stains often contain

    A Sodium chloride B Hydrochloric acid C Calcium oxide D Glycerine
20. Question 20 of 25

    Limewater turns milky when

    A Oxygen is passed through it B Hydrogen is passed through it C Carbon dioxide is passed through it D Chlorine is passed through it
21. Question 21 of 25

    Hard water is caused by dissolved salts of

    A Sodium and potassium B Iron only C Lead only D Calcium and magnesium
22. Question 22 of 25

    Mixing bleach with ammonia or acids is dangerous because it

    A Makes a stronger cleaner B Produces harmless water C Creates oxygen only D Releases toxic gases such as chloramine or chlorine
23. Question 23 of 25

    Plaster of Paris is

    A Calcium sulphate hemihydrate B Calcium carbonate C Calcium chloride D Sodium sulphate
24. Question 24 of 25

    The most effective concentration of alcohol (ethanol or isopropanol) for disinfecting skin is about

    A 10 per cent B 100 per cent C 30 per cent D 70 per cent
25. Question 25 of 25

    The pH of most household bleach and drain cleaners is

    A Strongly basic (above 11) B Strongly acidic C About 7 D Below 3

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