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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 Question 13 : Which form of phosphorous is most reactive? red white brown black Question 14 : Which of these group V elements form the most stable pentahalides B P As Sb Question 15 : Which of the group V element forms alloys with metals? Ar Bi Sb N
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