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Chemistry Past Questions

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1341
Starch can be converted to ethyl alcohol by
  • A. distillation
  • B. fermentation
  • C. isomerization
  • D. cracking
  • E. cooking
View Answer & Discuss (2) JAMB 1979
1342
The reaction between hydrogen and iodine may be represented by the equation H2(g)+ I2(g) → 2HI(g), and is exothermic. Therefore
  • A. an increase in temperature favours the forword reaction
  • B. an increase in pressure favours the backward reaction
  • C. both pressure and temperature muct be increased to favour the forward reaction
  • D. a decrease in temperature will favour the forward reaction
  • E. a decrease in pressure and an increase in temperature will favour the forward reaction
View Answer & Discuss (7) JAMB 1979
1343

Weighed salts Y and Z were left exposed in the laboratory overnight. In the morning Y had gained weight, and Z had become liquid. What conclusion could be drawn about the nature of the two salts?

  • A. Z is efflorescent
  • B. Y and Z are efflorescent
  • C. Y and Z are deliquescent
  • D. Y and Z are hygroscopic
  • E. Y is deliquescent
View Answer & Discuss (23) JAMB 1979
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1344
In the manufacture of iron in the blast furnace, iron (lll) oxide is mixed with coke and limestone, and different reactions occur in the process. Which of the following statements is true with respect to these reactions?
  • A. the coke is a powerful reducing agent and easily converts the iron oxide to iron
  • B. the calcuim carbonate reacts with SiO2 an earthly impurity in the ore, to from calcuim silicate
  • C. the coke will react with the iron produced to form steel
  • D. all the carbondioxide required in the process comes from the decomposition of the calcium carbonate
  • E. the calcium carbonate decomposes to give calcium oxide, which then forms calcium silicate with the earthly impurity
View Answer & Discuss (9) JAMB 1979
1345

Which of the following statements is true?

  • A. an increase in the temperature of a given mass of gas increases the number of gas molecules
  • B. an increase in the temperature of the gas does not affect the kinetic energy
  • C. an increase in the pressure of the gas is proportional to the increase in volume
  • D. a increase in the pressure of a gas is proportional to the decrease in volume at constant temperature
  • E. a decrease in the pressure of the gas decreases the number of gas molecules present
View Answer & Discuss (5) JAMB 1979
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