Question 6 : The purest form of silicon dioxide is-----
Question 7 : Which of the following trihalides of nitrogen is stable?
Question 8 : Which of the following is used in baking powder and toothpastes?
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?
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