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Chemistry JAMB Past Questions

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1036
100 cm3 of oxygen is made to react with 50 cm 3 of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?
  • A. 5 cm3
  • B. 25 cm3
  • C. 50 cm3
  • D. 75 cm3
  • E. 100 cm3
View Answer & Discuss (10) JAMB 1982
1037
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 (7) JAMB 1981
1038
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 (5) JAMB 1981
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1039
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
1040

When air is compressed?

  • A. its density decreases
  • B. it solidifies
  • C. its temperature decreases
  • D. its temperature increases
  • E. its temperature remains unchanged
View Answer & Discuss (21) JAMB 1981
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