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Chemistry 2015 WAEC Past Questions

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NECO offline past questions - All questions, answers & explanations in one app 25712
26

When a reaction is endothermic,

  • A. Enthalpy change, \(\Delta\)H is negative
  • B. Heat content of a product is less than the heat content of a reactant
  • C. Heat content of reactants is less than the heat content of product
  • D. The reaction is non-spontaneous
View Answer & Discuss (3) WAEC 2015
27

Which of the following statements about intermolecular distances and cohesive forces between gas is correct? They are

  • A. Both large
  • B. Both negligible
  • C. Constant and negligible
  • D. Large and negligible
View Answer & Discuss (7) WAEC 2015
28

The following diagram illustrates the rate curve that was obtained when Mg reacted with excess dilute HCl.

The diagram became horizontal at X because

  • A. The reaction was slowed down
  • B. All the dilute HCl has reacted
  • C. All the Mg has reacted
  • D. Hydrogen gas is produced at a steady rate
View Answer & Discuss (6) WAEC 2015
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29

An example of an acid salt is

  • A. CH3COOONa
  • B. Mg(OH)Cl
  • C. NaHSO4
  • D. (NH4)2SO4
View Answer & Discuss (13) WAEC 2015
30

Which of the following oxides can be reduced by hydrogen?

  • A. Aluminium oxide
  • B. Magnesium oxide
  • C. Sodium oxide
  • D. Silver oxide
View Answer & Discuss (2) WAEC 2015
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