chem - oxidizing agents c Propose a reasonable...

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UNIVERSITY ENTRANCE EXAMINATION CHEMISTRY Time: 1 pm to 3 pm Duration: 2 hours Please read the following instructions carefully. 1. This examination has TWO (2) printed pages. 2. Answer all questions. Write your answers on the answer paper provided. 3. At the end of the examination, attach the cover paper on top of your answer script. Complete the information required on the cover paper. The cover paper for this examination is GREEN. 4. Do not take any paper, including the question paper and unused answer paper, out of the examination hall.
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Question 1 a. Propose a reasonable acid-base reaction (with balanced equation) and identify the acid and base in the substrates. b. Propose a reasonable redox reaction (with balanced equation) and identify the reducing and
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Unformatted text preview: oxidizing agents. c. Propose a reasonable disproportionation reaction (with balanced equation). Is this a variant of redox reaction? If so, what is reduced and what is oxidized (in the reaction that you have proposed)? If not, why not? (30 marks) Question 2 Examine and discuss the validly of the following statement critically and concisely: “ NCl 5 is a reasonable and stable compound because the five electrons on nitrogen can form bonds with the five surrounding chloride. ” (35 marks) Question 3 What is the pH of a 0.015 M solution of sodium acetate, NaCH 3 CO 2 ? State your assumptions, if any, clearly. (Water ionization constant K w = 1.0 x 10-14 at 25 o C; equilibrium constant b (CH 3 COO-) = 5.6 x 10-10 ) (35 marks) 2...
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This note was uploaded on 12/09/2011 for the course ELECTRICAL 101 taught by Professor Huanhoang during the Spring '11 term at National University of Singapore.

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chem - oxidizing agents c Propose a reasonable...

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