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Chemistry 2024 JAMB Past Questions

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116

The law which states that a pure chemical compound, no matter how it is made, will be made up of the same elements contained in the same proportion by mass is

  • A. law of conservation of masses
  • B. law of definite proportion
  • C. law of multiple proportion
  • D. law of reciprocal proportion
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117

The stability of atomic nucleus is determined by ratio of 

  • A. Neutron/electron
  • B. Neutron/proton
  • C. positron/neutron
  • D. electron/proton
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118

25.0g of potassium chloride were dissolved in 80g of distilled water at 30\(^0\)C. Calculate the solubility of the solute in mol dm\(^3\). [K =39, Cl = 35.5]

  • A. 3.9 moldm\(^3\)
  • B. 4.6 moldm\(^3\)
  • C. 4.0 moldm\(^3\)
  • D. 4.2 moldm\(^3\)
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119

An example of a physical change is 

  • A. slaking of lime
  • B. liquefaction of liquids
  • C. dissolution of limestone in acid
  • D. rusting of iron
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120

The product formed when ethyne is passed through a hot tube containing finely divided iron is

  • A. polymeric
  • B. saturated
  • C. hydrated
  • D. aromatic
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