WAEC GCE CHEMISTRY THEORY, OBJ AND PRACTICAL ANSWERS

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Wednesday, 17th February, 2021
PC5052 Chemistry 2 (Essay) 2hrs
9:30am – 11:30am
PC5051 Chemistry 1 (Objective) 1hr
11:30am – 12:30pm
PC5053 Chemistry 3 (Alternative to Practical Work)
1hr 30mins
2:00pm – 3:30pm

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2021 WAEC-GCE CHEMISTRY-ANSWERS
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1a)
Pick 2 Only…
-Precipitation Titrations
-Complexometric Titrations
-Redox Titrations
-Acid Base Titrations

1di)
-Carbon dioxide
-Methane
-Ozone
-Nitrous oxide

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(5a)
Hardness of water can be defined as water that has high mineral content. The hardness of water is formed when water percolates through deposits of limestone, chalk, or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates, and sulfates. Iron oxides or iron carbonates can give a reddish-brown coloration to hard water deposits.

(5aii)
(i) Calcium ions in the water are good for children’s teeth and bones.
(ii) It helps to reduce heart disease.

bi)
Equation for laboratory preparation of chlorine
3Cl2+6NaOH======>
5Nacl+Nacl03+3H20

bii)
Reaction of Chlorine with hot sodium hydroxide solution solution leads to the formation of sodium chrorate(v)-Naclo3

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