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Chemistry Past Questions and Answers

Chemistry Questions

Question 781:
JAMB 1993
Which of these salts will produce its metal, oxygen and nitrogen (IV) oxide on heating?
SchoolNGR Classroom
  • A Silver and trioxonitrate (V)
  • B Sodium trioxonitrate (V)
  • C Calcium trioxonitrate (V)
  • D Lithium trioxonitrate (V)
View Answer & Explanation
Question 782:
JAMB 1993
An experiment produces a gaseous mixtures of carbon (IV) oxide and carbon (II) oxide. In order to obtain pure carbon (II) oxide, the gas mixture should be?
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  • A Passed over heated copper (II) oxide
  • B Bubbled through concentrated tetraoxosulphate (IV) acid
  • C Bubbled through sodium hydroxide solution
  • D Bubbled through water
View Answer & Explanation
Question 783:
JAMB 1993
Which of the following is a property of ionic chlorides?
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  • A They can be decomposed by heat
  • B They react with aqueous AgNO<sub style='font-size: smaller;'>3</sub> to give a white precipiate which is soluble in excess ammonia
  • C They explode when in contact with dry ammonia
  • D They react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine gas
View Answer & Explanation
Question 784:
JAMB 1993
When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.<br/>The products of this reaction are?
SchoolNGR Classroom
  • A PbO<sub style='font-size: smaller;'>(s)</sub> + Br<sup style='font-size: smaller;'>-</sup> + KNO<sub style='font-size: smaller;'>3</sub>
  • B Br<sub style='font-size: smaller;'>2</sub> + NO<sub style='font-size: smaller;'>2(g)</sub> + PbBr<sub style='font-size: smaller;'>2(s)</sub>
  • C PbO<sub style='font-size: smaller;'>(s)</sub> + K<sup style='font-size: smaller;'>+</sup><sub style='font-size: smaller;'>(aq)</sub> + Br<sub style='font-size: smaller;'>(aq)</sub> + NO<sub style='font-size: smaller;'>2(g)</sub>
  • D PbBr<sub style='font-size: smaller;'>2(s)</sub> + K<sub style='font-size: smaller;'>(aq)</sub> + K<sup style='font-size: smaller;'>+</sup><sub style='font-size: smaller;'>(aq)</sub> + NO<sub style='font-size: smaller;'>3(aq)</sub>
View Answer & Explanation
Question 785:
JAMB 1993
Bronze is an alloy of?
SchoolNGR Classroom
  • A Silver and copper
  • B Silver and gold
  • C Copper and nickle
  • D Copper and zinc
  • E Copper and tin
View Answer & Explanation

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