polytetra (d) polystyrene (c) (e) (c) polypropylene (cellulose, starch, etc) pol

Question

polytetra (d) polystyrene (c) (e) (c) polypropylene (cellulose, starch, etc) polyvinylchloride (f polysaccharide 28. Which oxide compound below is amphoteric (and amorphous? can sometimes be (a) Na2O (b) CaO (c) SiO (d) Seo (e) Brzos 29. Which element below is least likely to form a compound containing a double or triple bond? (a) C (b) N (c) O (d) Pl 30. The component of air which has the highest abundance is: (a) N2 (b) O2 (c) Ne (d) Ar (e) H20 31. The component of air with the second highest abundance has that highest abundance because (a) it is produced by photosynthesis (b) it is a noble gas (c) it evaporates from the oceans (d) it is what our clouds are made of (e it has a very strong triple bond

Explanation / Answer

SiO2 is "Not an amphoteric oxide" but SiO2 is a weak acidic oxide. Silicon is too similar in electronegativity to oxygen to form ionic bonds.Therefore, because Silicon dioxide does not contain oxide ions, and it doesnt react with acids it has no basic properties. Thus it is weakly acidic in nature.

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