/6 Science Quiz (for 12 to 16 years old): Quiz 8 1 / 6Permanent hardness of water can be removed by adding potassium permanganate washing soda chlorine bleaching powder 2 / 6The two elements that are frequently used for making transistors are silicon and germanium iridium and tungsten niobium and columbium boron and aluminium 3 / 6Marsh gas is methane nitrogen hydrogen ethane 4 / 6The filament of an electric bulb is made of graphite tungsten nichrome iron 5 / 6Diamond is an allotropic form of sulphur silicon carbon germanium 6 / 6In fireworks, the green flame is produced because of potassium sodium barium mercury Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback By WordPress Quiz plugin