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