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Monday, 15 June 2026
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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1351:
Propane carbon(IV)oxide diffuse at the same rate because [H = 1.00, C = 12.0, O = 16.0]
  • A They are both gases
  • B Their molecules contain carbon
  • C They have the same relative molecular mass
  • D Both are denser than air
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Question 1352:
The energy which accompanies the addition of an electron to an isolated gaseous atom is
  • A Atomization
  • B Electronegativity
  • C Electron affinity
  • D Ionization
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Question 1353:
An aqueous solution of (NH4)2 SO4 is
  • A Acidic
  • B Alkaline
  • C Amphoteric
  • D Neutral
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Question 1354:
When NH4Cl(s) is dissolved in water, the container feels cold to touch. This implies
  • A The process is endothermic
  • B The process is exothermic
  • C NH4Cl forms a saturated solution
  • D NH4Cl is highly soluble in water
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Question 1355:
The pH of four solutions M,N,Q and R are 2,6,8 and 11 respectively.
Which of the following deductions about the solutions is correct?
  • A The pH of N is increased when the solution is diluted
  • B The pH of Q is increased when the solution is evaporated
  • C M is the most alkaline solution
  • D R is the most acidic solution
View Answer & Explanation