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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",5,"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},"7vRTeHuHW6gzRezrItNtmqtoi3rFKs","q","200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
\nWhen cooled, the final volume of air recorded was 158cm³. Estimate the percentage of oxygen in the air?","ans",[414],2,"1997","course","chemistry","exp","Volume of O₂ used = 200 - 158 = 42 cm³
\n% of O₂ = (42)/(200) x 100% = 21%","opts",[422,423,424,425],"31%","27%","21%","19%",11,"11","initComment","initReply","actionData","errors"]

JAMB - Chemistry (1997 - No. 11)

Explanation

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