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
Question 13 : Which form of phosphorous is most reactive?
Question 14 : Which of these group V elements form the most stable pentahalides
Question 15 : Which of the group V element forms alloys with metals?
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