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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 86:
NECO 2008
Which of these arrangement of elements is in order of increasing ionization energy?
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  • A Boron, Carbon, Flourine, Nitrogen
  • B Boron, Carbon, Nitrogen, Flourine
  • C Carbon, Boron, Nitrogen, Flourine
  • D Flourine, Nitro9en, Carbon, Boron
  • E Nitrogen, Flourine, Carbon, Boron
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Question 87:
NECO 2008
The gas in air used by plants for photosynthesis is ____________
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  • A Argon
  • B Carbon (IV) oxide
  • C Nitrogen
  • D Oxygen
  • E Water vapour.
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Question 88:
NECO 2008
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because ____________
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  • A Sodium hydroxide is a strong alkali
  • B Sodium is more reactive than zinc
  • C Zinc is more reactive than sodium
  • D Zinc hydroxide is amphoteric
  • E Zinc hydroxide is unstable
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Question 89:
NECO 2008
A chemical system is at equilibrium when ____________
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  • A δ G is positive
  • B δ G is zero
  • C δ S is negative
  • D δ S is positive
  • E δ S is zero.
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Question 90:
NECO 2008
Brownian motion explains ____________
SchoolNGR Classroom
  • A Boyle’s law
  • B Collision theory
  • C Laws of chemical combination
  • D Molecular motion in liquids and gases
  • E Vibrational motion in liquids.
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