/6 Science Quiz (for 12 to 16 years old): Quiz 17 1 / 6The gas usually filled in the electric bulb is oxygen nitrogen hydrogen carbon dioxide 2 / 6Quartz crystals normally used in quartz clocks etc. is chemically silicon dioxide germanium oxide a mixture of germanium oxide and silicon dioxide sodium silicate 3 / 6Washing soda is the common name for Sodium bicarbonate Sodium carbonate Calcium bicarbonate Calcium carbonate 4 / 6Carbon, diamond and graphite are together called isotopes isomers isomorphs allotropes 5 / 6Chlorophyll is a naturally occurring chelate compound in which central metal is iron magnesium copper calcium 6 / 6Heavy water is deuterium oxide PH7 tritium oxide rain water Your score is 0% Restart quiz Next quiz Please rate the quiz Send feedback By WordPress Quiz plugin
