UTME Chemistry Examination Past Questions 1

Questions originated from jamb and post jamb examinations

1. All of the following statements about sodium acetate are true except (a) It is an ionic compound (b) It is soluble in water  (c) Contains carbon (d) It is also called vinegar (e) If dissolved in water the solution has a pH > 7

2. Which of the following molecule is an acid?  (a) NH+  (b) HF  (c) HF and NH  (d) None of them

3. How many milliliters of 0.300Mol of sodium hydroxides must be added to a 150mL solution of 0.100Mol hydrochloric acid to obtain a solution with a pH of 7.00? (a) 25ml (b) 50ml (c) 75ml (d) l00ml (e) l50ml

4. Which of the following gases has a higher density than oxygen (measured at the same conditions)? (a) N2  (b) Fz  (c) CHr  (d) H e) H2O (vapours)

5.Which of the following statements about carbon monoxide is NOT true? (a) Is less dense than CO2 (b) Is a polar substance (c) Is a covalent substance (d) It contains 2 sigma bonds (e) All of them are true

6. Which of the following bonds is intermolecular? (a) Ionic bond (b) Covalent bond (c) Metallic bond (d) Hydrogen bond (e) None of them

7. When methane burns in excess oxygen, the product would be (a) CH4O2   (b) CO + H2O  (c) CO + CH2OH (d) CO2 + 2H2O

8. Which of the following gases is known to shield the earth from harmful ultraviolet radiation? (a) CO  (b) CO2     (c) CFC2  (d) SO  (e) O

9. Alloys are mixtures of metailic substances. Which of the following pairs are matched INCORRECTLY? (a) Brass , copper and zinc (b) Steel , iron and copper  (c) Bronze , copper, zinc and others  (d) Pewter , tin, copper, bismuth, and antimony   (e) Sterling, silver and copper

10. Which of the following types of hybridization gives rise to tetrahedral molecule? (a) sp (b) rp’ (c) sp3 (d) spdf (e) spf

11. Which of the following does not affect the rate of a chemical reaction? (a) Concentration of the reactants (b) Addition or presence of a catalyst (c) size of the reacting particle (d) Temperature of the reaction (e) pressure

12. Which of the following substance are arranged in their correct order of increasing melting point (a) Sodium chloride, sulphur, diamond  (b) Diamond, sodium chloride and sulphur  (c) Sulphur, sodium chloride and diamond  (d) Sulphur, diamond, sodium chloride  (e) All of the above

13. Catalytic hydrogenation of alkene produces a compound with general  (a) C,H2’*1OH   (b) CnH2n*1   (c) C,,H2,,*2  (d) cuH2n-r  (e) C,H2n

14. An element Z has combining power of 3. Which of the following formulae is correct of its compound? (a) ZSO3 (b) ZCl2 (c) Z2O3 (d) ZS3 (e) Z3O

15. An anhydride is  (a) A compound which has no water of crystallization  (b) An oxide whose solution in water has a pH greater than 7  (c) An oxide whose solution in water has a pH less than 7  (d) An oxide that has hydrogen atom  (e) None of the above

16. When plastic and packaging materials made from chloroethaene are bunt in the open, the mixture of gases released into the atmosphere is most likely to contain: (a) Ethane (b) chlorine (c) hydrogen chloride (d) ethane e) ethyne

17. The relatively high boiling points of alkanols are due  (a) Ionic bonding (b) Aromatic character (c) Covalent bonding (d) Hydrogen bonding (e) Dative covalent bonding

18. Which of the following pairs has compounds that are isomers? (a) Propanal and proparnone (b) Ethanoic acid and ethylmethanoate  (c) Ethanoic acid and ethan-1,2-diol  (d) 2-methl,lbutane and 2,2-dimethyl propane  (e) Isopropanol and propane

19. Group 1A metals are not found free in nature because they (a) Are of low melting and boiling points (b) Have weak metailic bonding (c) Conduct electricity and heat (d) Are very reactive (e) They are not reactive

20. When sodium ethanoate is treated with a few drops of concentrated tetraoxosulphate(VI) acid one of the products is (a) CH:CO:H (b) CI{TCOOCH: (c) CH3COOC2H6 (d) CTH5COOCHT (e) CH3COH

21. When sodium is added to ethanol, the product are (a) Sodium hydroxide and water (b) Sodium hydroxide and hydrogen (c) Sodium hydroxide and water (d) Sodium hydroxide and hydrogen (e) None of the above

22. Chromatography is used to separate components of mixtures which differ in their rates of (a) Diffusion (b) Migration (c) reaction (d) Sedimentation (e) None of the above

23. How many moles of oxygen molecules Would be produced from the decomposition of 25 moles of potassium trioxochlorate(V) ? ( a) 2.50  (b) 50  (c) 335  (d) 7.50 (e) 37.s

24. Which of the following statements is TRUE of the complete hydrolysis of a glyceride by sodium hydroxide? (a) 3 moles of NaOH are required tbr each mole of glyceride (b) 3 moles of glycerol are produced (c) Only one mole of soap formed (d) Concentrated H2SO4 is essential for the completion of the reaction (e) All the statements above25. The oxidation states of chlorine in HOCI, HCIO3 and HCIO4 are respectively (a) -1, +5 and +7  (b) -1,+3 and+4  (c) +1,+5 and +7  (d)-1, -5and+7

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