Chemistry 2021 Past Questions | JAMB

Study the following Chemistry past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

  1. Give the common name for the following compound (CH3)2CH CH2 -Br
  • A. Isobutyl bromide
  • B. Methyl bromide
  • C. propyl bromide
  • D. Butyl bromide

2. The enzyme that converts glucose to ethyl alcohol is?

  • A. maltase
  • B. zymase
  • C. Diatase
  • D. Invertase

3. The scientist who stated that matter can be converted into energy is? 

  • A. Boyle
  • B. Lavoiser
  • C. Avogadro
  • D. Einstein

4. What is the IUPAC name for the following compound?  HCCCH3

  • A. Acetylene
  • B. Methyl acetylene
  • C. Butanol
  • D. Decanoic acid

5. What is the chemical name for the compound Cu2CO3?

  • A. Copper (iii) carbonate
  • B. Copper (ii) carbonate
  • C. Copper (i) carbonate
  • D. Copper

6. A ‘breath test’ used by traffic police to check drunken driving uses?

  • A. Tumeric on filter paper
  • B. Silica gel coated with saliva nitrate
  • C. Potassium permanganate-sulphuric acid
  • D. Potassium dichromatic-sulphuric acid

7. Which one of the following is not a mixture

  • A. Air
  • B. Mercury
  • C. Milk
  • D. Cement

8. Which of the following is a non-metal that remains at room temperature?

  • A. Chlorine
  • B. Phosphorus
  • C. Bromine
  • D. Helium

9. Which of the following are chemical changes? 

I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up

  • A. I and II
  • B. I, II, and III
  • C. III and IV
  • D. all of the above

10. The atomic weight of nitrogen is?

  • A. 10
  • B. 12
  • C. 14
  • D. 16

11. The gas which causes global warming is

  • A. O2
  • B. CO2
  • C. N2
  • D. He

12. Oxygen is absent in?

  • A. Kerosene
  • B. Soil
  • C. Glass
  • D. Cement

13.  A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?

  • A. Sublimation
  • B. Evaporation
  • C. Diffusion
  • D. Radiation

14.  The maximum electron in N shell is?

  • A. 2
  • B. 8
  • C. 18
  • D. 32

15.  Neutrons were discovered by?

  • A. James Chadwick
  • B. Ernest Rutherford
  • C. J.J Thompson
  • D. John Dalton

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