(A)Draw the most predominant resonance structures for SO32- (16S, 8O) (3 mrks)
(B)Predict and draw the shape of the Al2Cl6 molecule. (13Al, 17Cl) ( 2 mrks)
(C)Explain why metals conduct electricity but their ionic salt solids do not.( 2mrks)
(D) Explain why BF3 is non-polar, yet the B-F bond is polar.(5B 9F) (2mrks)
(E) 8g of NaOH pellets were dissolved in a liter of solution with distilled water. In order to standardize this solution, 10.0 mls of an acid solution containing 19.6 g of H2SO4 per liter completely neutralized 25 mls of the NaOH solution.
(i)Why was it necessary to standardize the NaOH solution, even though the original concentration was known? (2 mrks)
(ii)Write a balanced chemical reaction equitation for the above neutralization.(1 mrk)
(iii)Calculate the molarity and normality of the H2SO4 solution.(2 mrks)
(iv)Calculate the molarity and normality of the NaOH solution.(3 mrks)
(v)Calculate the weight of NaOH per litre of solution.( 2 mrks)
(vi)Calculate the % purity of NaOH.(1 mrk)
[Relative atomic masses: H=1, S=32, O=16, Na =23]

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