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