Welcome to your UNILAG POST JAMB ( CHEMISTRY 2018) 1. The oxidizing agent in the reaction, 3Br2 + 60H- = BrO3- + 5Br- + 3H20 is A. Br2 B. OH- C. A BrO3- D. e-E. H2O. 2. When heat is absorbed during a chemical reaction, the reaction is said to be A. thermodynamic B. exothermal C. isothermal D. endothermic 3. Given the reaction at equilibrium: 2C0(g) + O2(g) # 2CO2(g) When the reaction is subjected to stress, a change will occur in the concentration of A. reactants, only B. products, only C. both reactants and products D. neither reactants nor products 4. Given the reaction at equilibrium: N2(g) + O2(g) # 2N0(g) as the concentration of N2(g) increases, the concentration of O2(g) will A. decrease B. increase C. remains the same D. vanishes 5. If a reaction is exothermic and there is a great disorder, it means that A. The reaction is in a state of equilibrium B. There will be a large increase in free energy C. There will be a large decrease in free energy D. The reaction is static. 6. In the chemical reaction of A + B = C + D, more of D is formed A. if the concentration of A is reduced B. if the concentration of B is reduced C. if the concentration of C is reduced D. if it is continuously removed from the reaction mixture 7. In what way is equilibrium constant for the forward reaction related to that of the reverse reaction? A. The addition of the two is expected to be one. B. The product of two is expected to be one. C. The two equilibrium constants are identical. D. The product of the two is always greater than one. 8. In which reaction will the point of equilibrium shift to the left when the pressure on the system is increased? A. C(s) + O2(g) # CO2(g) B. CaCO3()s CaO(s) + CO2(g) C. 2Mg(5) + O2(g) =, 2Mg0(s) D. 2H2(g) + O2(g) # 2H20(g) 9. The furring of kettles is caused by the presence in water of A. calcium trioxocarbonate (IV) B. calcium tetraoxosulphate (VI) C. calcium hydroxide D. calcium hydrogentrioxocarbonate (IV) 10. Which is a property of a reaction that has reached equilibrium? A. The amount of products is greater than the amount of reactants. B. The amount of products is equal to the amount of reactants. C. The rate of the forward reaction is greater than the rate of the reverse reaction. D. The rate of the forward reaction is equal to the rate of the reverse reaction. 11. Which of the following combination of conditions many increase the rate of a chemical reaction. A. Decrease in temperature, increase in concentration of the reactant B. Increase in temperature, addition of a catalyst, decrease in the surface area of the reactant C. Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactant D. Decrease in temperature, concentration and surface area of the reactants E. Addition of catalyst and in the absence of light. 12. "Quicklime" has the formula A. Ca(OH)2 B. CaO C. CaCO3 D. CaSO4.2H20 13. A Transition metal is different from a non-transition metal because A. it has an octet configuration B. it is very stable C. it is coloured D. it has incomplete outer shell d-electrons 14. Chlorine is produced commercially by A. electrolysis of dilute HCI B. electrolysis of brine C. neutralization of HCI D. heating potassium trioxochlorate (V) 15. Chlorine, bromine and iodine resemble one another since they A. dissolve in alkalis B. react violently with H2 without heating C. displace each other from solutions of their salts D. are gases 16. Liquid oxygen may be produced by condensation of air using this coolant A. liquid phosphorus B. liquid gas C. liquid paraffin D. liquid nitrogen 17. One of these is another form of oxygen A. hydroxide B. ozone C. peroxide D. sulphide 18. One of these metals is not an alkali metal A. K B. Cs C. Sr D. Rb 19. One of these reactions represents the laboratory preparation of hydrogen. A. C(s) + H20(0-0 CO(g) + H2(g) B. 2Na(s) + 2H200) -4 2Na0Hoco + H2(g) C. Cu(s) + H20(1) .—)' CUO(s) + H2(g) D. Zn(s) + 2HCI(aq) —0 ZnC12(aq) + H2(g) 20. The formation of ozone by reaction of 02 with atomic oxygen in UV light occurs in A. upper atmosphere B. inner atmosphere C. stratosphere D. hemisphere 21. The halogen which is chiefly produced commercially from sea water is A. Fluorine B. chlorine C. Bromine D. iodine 22. The most stable allotropic form of sulphur at normal conditions is A. monoclinic sulphur B. rhombic sulphur C. amorphous sulphur D. plastic sulphur 23. The products obtained when the following chemical reaction is completed and balanced are HNO3 + Ca(OH)2 —0 A. CaNO3 + H2O B. Ca(NO3)2 + 2H20 C. CaO + 2NO2 + 3H20 D. Ca + 2NO3 + 2H20 24. What is the role of iron and Aluminium oxide in ammonia production? A. dehydrating agent B. catalytic agent C. oxidizing agent D. bonding agent 25. When carbon IV oxide is bubbled through lime water, the solution becomes milky due to formation of A. Ca(HCO3)2 B. CaCO3 C. Ca(NO3)2 D. CaCl2 Post navigation UNILAG POST UTME (CHEMISTRY 2019) UNILAG POST UTME (CHEMISTRY 2017)
