FORM TWO POST MOCK KILIMANJARO CHEMISTRY EXAMINATION

SECTION B (70 MARKS)
Answer all questions in this section.
3. (a)Calculate the oxidation state of the underlined element in each of the following:- (2@=6 Marks)
(i) Cr2O72-
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(ii) KClO3
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(iii) NH4+
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(b) A student tested five solutions M, N, O, P and Q with a universal indicator solution to find

their pH values. The following results were obtained. (1@= 04 Marks)
SOLUTION pH VALUE
M 14
N 5
O 7
P 1
Q 9
Which of the above solutions was;-
(i) Neutral solution ……………………………………………………………………………………
(ii) Strong acid ……………………………………………………………………………………………
(iii) Strong alkali …………………………………………………………………………………………
(iv) Weak acid…………………………………………………………………………………………….