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1036
9.8g of solid potassium chlorate (KCIO3) were added to 40 cm3 of water and heated to dissolve all the solid. As he solution cooled, crystals of potassium chlorate started forming at 60°C. The solubility of potassium chlorate at 66°C is therefore?
  • A. 24.5 mole per dm3
  • B. 0.2 mole per dm3
  • C. 10.0 mole per dm3
  • D. 20.0 mole per dm3
  • E. 2.0 mole per dm3
View Answer & Discuss (15) JAMB 1982
1037
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
1038
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
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1039
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
1040
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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