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