Chemistry Exam Past Questions and Answers | JAMB, WAEC and NECO

Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.

• Question 301:

  

  The compound above exhibits

  Options:
  A) Geometric isomerism
  B) Positional isomerism
  C) Structural isomerism
  D) Optical isomerism
  Show Answer
  The correct answer is D .
• Question 302: The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as? Options:
  A) Brownian movement
  B) condensation
  C) evaporation
  D) liquefaction
  Show Answer
  The correct answer is C .
• Question 303:

  Calculate the volume in cm³ of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s

  {F = 96500 Cmol^-1, Molar volume of a gas at s.t.p. = 22.4 dm³}

  Options:
  A) 224.000 dm³
  B) 0.056 dm³
  C) 0.224 dm³
  D) 56.000 dm³
  Show Answer
  The correct answer is B .
• Question 304: The carbon atoms on ethane are Options:
  A) sp² hybridized
  B) sp³ hybridized
  C) sp⁴ hybridized
  D) sp hybridized
  Show Answer
  The correct answer is B .
• Question 305: The solubility of a salt of molar mass 101g at 20^oC is 0.34 mol dm^-3. If 3.40g of the salt is dissolved completely in 250cm³ of water in a beaker, the resulting solution is Options:
  A) A suspension
  B) Saturated
  C) Unsaturated
  D) Supersaturated
  Show Answer
  The correct answer is C .
• Question 306: One method of driving the position of equilibrium of an endothermic reaction forward is to? Options:
  A) increase temperature at constant pressure
  B) dcrease pressure at constant temperature
  C) cool down the apparatus with water
  D) decreases temperature at constant pressure
  Show Answer
  The correct answer is A .
• Question 307: The oxidation state of oxygen on tetraoxosulphate iv acid is Options:
  A) -4
  B) -2
  C) 4
  D) -8
  Show Answer
  The correct answer is B .
• Question 308: If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is Options:
  A) metallic
  B) covalent
  C) co-ordinate
  D) ionic
  Show Answer
  The correct answer is D .
• Question 309: A good drying agent should be Options:
  A) deliquescent
  B) effervescent
  C) hygroscopic
  D) efflorescent
  Show Answer
  The correct answer is C .
• Question 310: A fixed mass of gas has a volume of 92cm₃ at 3 ^oC. When will be its volume at 18 ^oC if the pressure remains constant Options:
  A) 15.3cm³
  B) 87.3cm³
  C) 552.0cm³
  D) 97.0cm³
  Show Answer
  The correct answer is D .