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These resources are designed to help you familiarize yourself with the exam format, identify key topics, and practice effectively. Whether you're preparing for the May/June or GCE sessions, our curated materials provide both objective and theory questions to enhance your study sessions.","tags","waec nigeria west africa examination council","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",10,"createdOn",1755991949910,"updatedOn","questionsCount",27220,"courseCount",23,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_420":421,"_110":426},"t48ZVLHyeIfoKZT0RuUp5BajkPjo1p","q","The oxidation number of sulphur in Fe₂(SO₄)₃ is","ans",[414],3,"2014","course","chemistry","exp","Fe₂(SO₄)₃ = 0
\n(+3 x 2) 9 3x + (-2 x 4 x 3) = 0
\n+6 + 3x -24 = 0
\n+3x - 18 = 0
\n3 x = 18
\nx = 18/3 = +6","opts",[422,423,424,425],"+2.","+3","+4.","+6.",15,"15","initComment","initReply","actionData","errors"]

WAEC - Chemistry (2014 - No. 15)

Explanation

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