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It assesses knowledge in subjects relevant to the candidate’s chosen course of study.","tags","utme jamb joint admission matriculation board unified tertiary matriculation examination nigeria africa","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",19,"createdOn",1755987353430,"updatedOn","questionsCount",29915,"courseCount",20,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_420":421,"_110":426},"QRMjowNWcFRigYvDelJikyZ1h0dLMF","q","In which of the following reactions does reduction takes place","ans",[414],3,"2001","course","chemistry","exp","Reduction is gain of electron and decrease in oxidation number. Option D is the only one with addition or gain of electron, as 2 electrons were gained by H ion to become Hydrogen molecule. There is also a decrease in oxidation from +2 to 0. Therefore option D is the correct answer","opts",[422,423,424,425],"Fe²⁺ - e^- → Fe³⁺","2O^2- →O₂ + 4e^-","Cr – 2e^- → Cr²⁺","2H⁺ + 2e^- → H₂",17,"17","initComment","initReply","actionData","errors"]

JAMB - Chemistry (2001 - No. 17)

Explanation

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