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Date Posted: 20:05:18 11/04/01 Sun
Author: Mr. Yeo Woei Ter
Subject: Re: still got summore...
In reply to: Jac 's message, "still got summore..." on 05:35:58 11/04/01 Sun

Hi Jac!

I think I have already answered you thru' e-mail. But here's the same thing again!

In page (10)6, the mistakes I referred to is Question 28 NOT Question 34!
In question 28, the substance that dissolves in both aquesous acid and aqueous alkali without evolution of gas must be an amphoteric oxide/hydroxide. (recall that amphoteric oxide/hydroxide reacts with acid as well as alkali to form salt and water). The answers provided are all wrong as there isn't any amphoteric hydroxide given!
I have said before that in the early 90s, there are 5 options in MCQ. option E is zinch hydroxide which is the correct answer!

As for Question 40, page (10)8, there are OH- ions in the solution. It's just that the concentration of H+ ions is much higher since the solution is acidic(pH value of 1).
(Recall that when we analyse the ions present in dilute HCl in electrolysis question, the ions are H+, Cl- and OH- ions.)

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