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Chemistry JAMB Past Questions

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2346

After breathing in a test tube that contains acidified K\(_2\)Cr\(_2\)O\(_7\), a man noticed the change in the colour of K\(_2\)Cr\(_2\)O\(_7\) from orange to green. This suggests the presence of

  • A. alkanone
  • B. alkanal
  • C. alkanol
  • D. alkanoic acid
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2347

Hydrochloric acid is not suitable in the preparation of ethanoic acid because it

  • A. is too acidic
  • B. is too volatile
  • C. can attack cork and rubber used as containers
  • D. turns blue litmus red
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2348

A radioactive element of mass 1g has half-life of 2 minutes, what fraction of the substance would have disintegrated after 10 minutes?

  • A. 1/4
  • B. 1/8
  • C. 1/16
  • D. 1/32
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2349

Hydrogen chloride gas and ammonia can be used to demonstrate the fountain experiment because they are

  • A. light
  • B. volatile
  • C. very soluble in water
  • D. heavy gases
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2350

In the conductance of aqueous CuSO\(_4\) solution, the current carriers are the

  • A. mobile electrons
  • B. metallic ions
  • C. hydrated ions
  • D. hydrated electrons
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