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Chemistry 1981 JAMB Past Questions

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21
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
  • A. 1s2 2s22p6 3s2
  • B. 1s2 2s22p6 3s2 3p1s2 2s22p6 3s1
  • C. 1s2 2s22p6 3s1
  • D. 1s2 2s22p6 3s°
  • E. 1s2 2s22p6 4s1
View Answer & Discuss JAMB 1981
22

In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

  • A. One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water
  • B. Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water
  • C. One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water
  • D. One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water
  • E. One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water
View Answer & Discuss (5) JAMB 1981
23
Na2CO3 + 2HCI → 2NaCI + H2O + CO2. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?
(1 mole of gas occupies 22.4 dm3 at s.t.p)
(Na = 23, C = 12, O = 16)
  • A. 44.8 dm3
  • B. 11.2 dm3
  • C. 100.1 dm3
  • D. 3.0 dm3
  • E. 22.4 dm3
View Answer & Discuss (5) JAMB 1981
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24
When sodium nitrate dissolves in water, ∆H is positive. This means that?
  • A. the reaction is catalysed
  • B. the reaction is complete
  • C. the reaction is exothermic
  • D. the reaction is endthermic
  • E. sodium nitrate is highly soluble in water
View Answer & Discuss (2) JAMB 1981
25
If an organic compound decolorizes bromine water then the compound is?
  • A. saturated
  • B. supersaturated
  • C. unsaturated
  • D. a solid
  • E. protonated
View Answer & Discuss (2) JAMB 1981
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208