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