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