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Question 6 : The purest form of silicon dioxide is----- rock crystal cristobalite silicates silibolite Question 7 : Which of the following trihalides of nitrogen is stable? chloride bromide floride iodide Question 8 : Which of the following is used in baking powder and toothpastes? calcium phosphate Calcium chloride sodium tripolyphosphate nitric acid 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
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