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