/6 Science Quiz (for 12 to 16 years old): Quiz 18 1 / 6Soda water contains sulphuric acid carbonic acid carbon dioxide nitrous acid 2 / 6Bromine is a highly inflammable gas red liquid black solid colourless gas 3 / 6Potassium nitrate is used in fertiliser glass medicine salt 4 / 6The hardest substance available on earth is Iron Diamond Gold Platinum 5 / 6Permanent hardness of water may be removed by the addition of potassium permanganate lime alum sodium carbonate 6 / 6Which of the gas is not known as greenhouse gas? Methane Hydrogen Carbon dioxide Nitrous oxide Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback By WordPress Quiz plugin