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?
Question 11 : Which of these compounds is used in toothpastes as a source of fluoride ion to harden dental enamel
carbon tetra fluoride
Question 12 : Silicones are a group of-------------
tetrachloro silicate polymer
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