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Chemistry JAMB Past Questions

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2426

In the laboratory preparation of oxygen using potassium trioxochlorate(V), tetraoxomanganate (VII), usually not recommended in modern laboratory because

  • A. it forms explosive mixture with carbonaceous materials
  • B. it is explosive.
  • C. it reacts with the catalyst
  • D. it is hazardous
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2427

The type of bond between copper(II) tetraamine and chlorine in [Cu(NH\(_3\))\(_4\)]Cl\(_2\)

  • A. dative
  • B. van der waals
  • C. ionic
  • D. covalent
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2428

Mg\(_{(s)}\)  +   2HCl\(_{(aq)}\) MgCl\(_2\)\(_{(aq)}\) +  H\(_2\)\(_{(g)}\)

In the reaction above, magnesium is a reducing agent because

  • A. oxidized
  • B. reduced
  • C. a metal
  • D. a solid
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2429

An example of a physical change is

  • A. addition of water to calcium oxide
  • B. corrosion of iron
  • C. dissolving sodium chloride in water
  • D. burning of charcoal
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2430

When a sample of air is passed through alkaline pyrogalol, potash and finally through U-tube containing fused calcium chloride, the components of air left unabsorbed are 

  • A. nitrogen and carbon(IV)oxide
  • B. noble gases and carbon(IV)oxide
  • C. noble gases and nitrogen
  • D. noble gases, nitrogen and carbon(IV) oxide
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