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 501:

  The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?

  Options:
  A) with cool running water
  B) sodium hydroxide solution
  C) iodine solution
  D) sodium trioxonitrate(v) solution
  Show Answer
  The correct answer is A .
• Question 502: An example of aliphatic unsaturated hydrocarbon is Options:
  A) pentane
  B) butanol
  C) propene
  D) benzene
  Show Answer
  The correct answer is C .
• Question 503: Neutralization involves a reaction between H₃O⁺ and? Options:
  A) CI^-
  B) OH^-
  C) NO₃^-
  D) CO₃^2-
  Show Answer
  The correct answer is B .
• Question 504: When water boilers are used for long period of time, the solid substances left behind as scale are Options:
  A) magnesium trioxosilicate (IV) and rust
  B) magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
  C) clay and magnesium troxosulphate (IV)
  D) clay and rust
  Show Answer
  The correct answer is A .
• Question 505: Which of the following metals does NOT form a stable trioxocarbonate (IV)? Options:
  A) Fe
  B) Al
  C) Zn
  D) Pb
  E) none of the options is correct
  Show Answer
  The correct answer is E .
• Question 506:

  Which of these alloys contains copper?

  Options:
  A) solder
  B) steel
  C) permallory
  D) bronze
  Show Answer
  The correct answer is D .
• Question 507:

  Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?

  2HCl + CaCO${}_3$ → CaCl${}_2$ + H${}_2$O + CO${}_2$

  Options:
  A) Increasing the concentration of the acid
  B) Increasing the surface area of CaCO${}_3$
  C) A and B
  D) Reducing the concentration of the acid
  Show Answer
  The correct answer is C .
• Question 508: Which of the following results in the fall of acid rain Options:
  A) oxide of lead
  B) particulate matter
  C) oxides of carbon
  D) gaseous hydrocarbon
  Show Answer
  The correct answer is C .
• Question 509:

  

  The IUPAC nomenclature of the compound above is

  Options:
  A) 2-bromo-3-chlorobutanol
  B) 3-bromo-2-chlorobutanol
  C) 3-chloro-2-bromobutanol
  D) 2-chloro-3-bromobutanol
  Show Answer
  The correct answer is B .
• Question 510: Aluminium hydroxide is used in the dyeing industry as a Options:
  A) dye
  B) dispersant
  C) salt
  D) mordant
  Show Answer
  The correct answer is D .