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Chemistry WAEC Past Questions

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1181

A reaction is endothermic if the

  • A. reaction vessel feels cool during the reaction
  • B. enthalpy change is negative
  • C. bond forming energy exceeds bond breaking energy
  • D. heat of formation of reactants exceeds heat of formation of products
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1182

In which of the following compounds does hydrogen form ionic compounds?

  • A. CH\(_{4}\)
  • B. HCl
  • C. NH\(_{3}\)
  • D. NaH
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1183

An organic compound has the empirical formula \(CH_{2}\). If its molar mass is 42\(gmol^{-1}\), what is its molecular formula?  (C = 12.0, H = 1.0)

  • A. \(C_{2}H_{4}\)
  • B. \(C_{3}H_{4}\)
  • C. \(C_{3}H_{6}\)
  • D. \(C_{4}H_{8}\)
View Answer & Discuss (1) WAEC 2018
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1184

Consider the following reaction equation: \(Br_{2} + 2KI \to 2KBr + I_{2}\). Bromine is acting as

  • A. an oxidizing agent
  • B. a reducing agent
  • C. an acid
  • D. a base
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1185

Ethene is produced from ethanol by

  • A. decomposition
  • B. hydrolysis
  • C. ozonolysis
  • D. dehydration
View Answer & Discuss (1) WAEC 2018
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