Time left 1 Bromine is a black solid red liquid colourless gas highly inflammable gas 2 Which of the gas is not known as green house gas? Methane Nitrous oxide Carbon dioxide Hydrogen 3 Quartz crystals normally used in quartz clocks et is chemically silicon dioxide germanium oxide a mixture of germanium oxide and silicon dioxide sodium silicate 4 Washing soda is the common name for Sodium carbonate Calcium bicarbonate Sodium bicarbonate Calcium carbonate 5 The gas usually filled in the electric bulb is nitrogen hydrogen carbon dioxide oxygen 6 Chemical formula for water is NaAlO2 H2O Al2O3 CaSiO3 7 The hardest substance available on earth is Gold Iron Diamond Platinum 8 Which of the following metals forms an amalgam with other metals? Tin Mercury Lead Zinc
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