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Chemistry Past Questions

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1081
The number of grammes of potassium hydroxide in 250cm3 of one molar solution is?
(K = 39, O = 16, H = 1)
  • A. 40g
  • B. 52g
  • C. 100g
  • D. 26g
  • E. 14g
View Answer & Discuss (5) JAMB 1982
1082

60cm3 of hydrogen are sparked with 20cm3 of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?

  • A. 60 cm3
  • B. 10 cm3
  • C. 40 cm3
  • D. 30 cm3
  • E. 70 cm3
View Answer & Discuss (19) JAMB 1982
1083
X + Y = Z is an equilibrium reaction. The addition of a catalyst?
  • A. increase the amount of Z produced in a given time
  • B. increases the rate of change in concentrations of X, Y and Z
  • C. increases the rate of disapearance of X and Y
  • D. increases the rate of the forward reaction
  • E. decreases the amounts of X and Y left after the attainment of equilibrium
View Answer & Discuss (17) JAMB 1985
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1084

What is the formula of sodium gallate if gallium (Ga)shows an oxidation number of + 3?

  • A. NaGaO3
  • B. Na2Ga(OH)3
  • C. NaGa(OH)3
  • D. NaGa(OH)4
  • E. NaGaO
View Answer & Discuss (7) JAMB 1985
1085
If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be?
  • A. automobile exhaust and biological decomposition
  • B. combustion of coal and automobile exhaust
  • C. biological decomposition only
  • D. combustion of coal, automobile exhaust and biological decomposition
  • E. combustion of coal and biological decomposition
View Answer & Discuss (26) JAMB 1985
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