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Question 9 : Glass is produced from mixture of silicates mainly of K and Ca Na and Al K and Al Na and Ca Question 10 : Which of these will give a positive brown ring test? nitric oxide nitric dioxide nitrogen oxide dinitrogen tetraoxide Question 11 : Which of these compounds is used in toothpastes as a source of fluoride ion to harden dental enamel stannous fluoride germanium fluoride carbon tetra fluoride Silicate fluoride Question 12 : Silicones are a group of------------- Organosilicon polymers tetrachloro silicate polymer silicon dioxide organosilicates
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