2021 – JAMB CHEMISTRY PAST QUESTIONS & ANSWERS CBT PRACTICE You can also check in for latest; 9JA Music Gospel Music Foreign Music 9 123456789101112131415161718192021222324252627282930 2021 - JAMB Chemistry Past Questions & Answers Cbt Practice 1 / 30 1. Neutrons were discovered by? a) J.J Thompson b) James Chadwick c) Ernest Rutherford d) John Dalton 2 / 30 2. The only metal that is anti-bacterial is? a) Copper b) Iron c) Aluminium d) Sodium 3 / 30 3. 220g of carbon dioxide contains ----- moles a) 6 b) 3 c) 5 d) 4 4 / 30 4. Which of the following is a form of calcium carbonate? I. limestone II. marble III. chalk Iv. egg-shells a) I, II, III, and IV b) I, II and IV c) I only d) I and II only 5 / 30 5. The inherited traits of an organism are controlled by? a) Enzymes b) RNA molecules c) DNA molecules d) Nucleotides 6 / 30 6. A 'breath test' used by traffic police to check drunken driving uses? a) Potassium permanganate-sulphuric acid b) Tumeric on filter paper c) Potassium dichromatic-sulphuric acid d) Silica gel coated with saliva nitrate 7 / 30 7. The heat required to raise the temperature of the body by 1k is called? a) Specific heat b) None of the above c) Thermal capacity d) Water equivalent 8 / 30 8. The nucleus of an atom consists of? a) None of the above b) Protons and neutrons c) Electrons and protons d) Electrons and neutrons 9 / 30 9. The nucleus of a hydrogen atom consists of a? a) 1 proton, 2 neutron b) 1 proton only c) 1 neutron only d) 1 electron only 10 / 30 10. The enzyme that converts glucose to ethyl alcohol is? a) maltase b) Diatase c) zymase d) Invertase 11 / 30 11. The mass of one Avogadro number of helium atoms is? a) 8.00gram b) 1.00gram c) 4.00gram d) 6.00gram 12 / 30 12. The scientist who stated that matter can be converted into energy is? a) Lavoiser b) Einstein c) Avogadro d) Boyle 13 / 30 13. The maximum electron in N shell is? a) 2 b) 8 c) 32 d) 18 14 / 30 14. 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) Evaporation b) Sublimation c) Radiation d) Diffusion 15 / 30 15. 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) all of the above b) i, II, and III c) III and IV d) I and II 16 / 30 16. The metal used to recover copper from a solution of copper sulphate is? a) Fe b) Na c) Hg d) Ag 17 / 30 17. Oxygen is absent in? a) Soil b) Kerosene c) Cement d) Glass 18 / 30 18. Soaps clean surfaces on the principle based on? a) surface tension b) floatation c) viscosity d) elasticity 19 / 30 19. The most abundant rare gas in the atmosphere is? a) He b) Ne c) Ar d) Xe 20 / 30 20. Which one of the following is not a mixture? a) Milk b) Air c) Cement d) Mercury 21 / 30 21. The atomic weight of nitrogen is? a) 10 b) 16 c) 12 d) 14 22 / 30 22. Which of the following is a non-metal that remains liquid at room temperature? a) Phosphorus b) Chlorine c) Helium d) Bromine 23 / 30 23. What is the IUPAC name for the following compound? HC≡ CCH3 a) Butanol b) Methylacetylene c) Acetylene d) Decanoic acid 24 / 30 24. An element having the atomic number 17 will resemble which of the following elements having an atomic number as given below? a) 18 b) 19 c) 35 d) 33 25 / 30 25. The mass number of a nucleus is? a) Always less than its atomic number b) Always more than the atomic weight c) The sum of the number of protons and neutrons present in the nucleus d) A fraction 26 / 30 26. The reactivity of fluorine is due to what? a) strong f-f bond b) small size of fluorine atom c) its high electro negativity d) availability of D-orbitals 27 / 30 27. Which gas causes global warming? a) CO2 b) N2 c) O2 d) He 28 / 30 28. What is the chemical name for the compound CuCO3? a) Copper b) Copper (iii) carbonate c) Copper (i) carbonate d) Copper (ii) carbonate 29 / 30 29. A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage? a) 20% b) 11.% c) 22.2% d) 10% 30 / 30 30. Give the common name for the following compound (CH3">33)2">22 CH CH2">22 -Br a) Isobutyl bromide b) Methyl bromide c) propyl bromide d) Butyl bromide Your score is The average score is 50% Restart Cbt Please click the stars to rate the quiz Send feedback
