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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",18,"createdOn",1755991949910,"updatedOn","questionsCount",27220,"courseCount",23,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_110":425},"sUVTSopuDnXUntvfXIMWmt5hNDMsKB","q","What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P _(s) + 5O₍₂₎_(g) → 2P₂O₅_(g)","ans",[414],1,"1992","course","chemistry","opts",[420,421,422,423,424],"0 to + 2","0 to 5","+4 to + 2","+4 to +5","+4 to +7",15,"15","initComment","initReply","actionData","errors"]

WAEC - Chemistry (1992 - No. 15)

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