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1.How many groups are there in p-block?, 2.What is ‘inert pair effect’?, , 3.How does metallic and non-metallic, character vary in a group?, , 4.Why do third — period elements expand, their covalence above four?, , 5.Why do heaver elements form mt — bonds?, , 6.Where does metalloids and non — metals, rit, , 7.Give the chemical formula of inorganic, LYN 42111 =, , 8.Give two examples of electron deficient, molecules., , 9.Arrange the following halides of boron in, , the increasing order of acidic character:, BF3, BCI3, BBr3, BI3., , 10.Why is boric acid considered as a weak, acid?, , 11.Why is boron metalloid?, , 12.Why do boron have unusual high melting, point?, , 13.Why does BF3 act as Lewis acids?
