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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,"_420":421,"_110":426},"aU0JeFmhrREL9OrmHXbsDFL1U4icKJ","q","What is the oxidation number of chromium in K₂CrO₄?","ans",[414],3,"2007","course","chemistry","exp","K₂CrO₄ (O.N of K) X 2 + O.N of Cr + (O.N of oxygen) X 4 = 0
\n1 X 2 + X + -2 X 4 = 0
\n2 + x + -8 = 0
\n2 + x - 8 = 0
\nx = 8 - 2 = + 6","opts",[422,423,424,425],"+1","+2","+4","+6",24,"24","initComment","initReply","actionData","errors"]

WAEC - Chemistry (2007 - No. 24)

Explanation

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