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Chemistry 1981 JAMB Past Questions

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11
the number of atoms in one mole of a substance is equal to?
  • A. the atomic number
  • B. the avogadro number
  • C. the gas constant
  • D. the number of neutrons
  • E. the number of electrons
View Answer & Discuss (4) JAMB 1981
12
Which of the following statements is NOT true of electrovalent compounds?
  • A. They are solids
  • B. They do not vaporized easily
  • C. They usually dissolve in water
  • D. The elements forming the compounds normally have their valency electrons in a shared state
  • E. They conduct electricity
View Answer & Discuss (1) JAMB 1981
13
If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?
  • A. a drying agent
  • B. an oxidizing agent
  • C. a dehydrated agent
  • D. a reducing agent
  • E. a hydrolysing agent
View Answer & Discuss (6) JAMB 1981
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
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14
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
  • A. a reducing agent
  • B. a nitrating agent
  • C. an oxidizing agent
  • D. a catalytic agent
  • E. a neutralizing agent
View Answer & Discuss (1) JAMB 1981
15

The brown coloration in nitric acid prepared in the laboratory can be removed by?

  • A. heating the acid
  • B. bubbling air through the acid
  • C. cooling the acid
  • D. adding a decolorizing agent
  • E. adding a base
View Answer & Discuss (7) JAMB 1981
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Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts