Chemistry Post Utme questions

1. Organic Chemistry is the branch of Chemistry that deals with ------- and -------
(A) Hydrogen & oxygen
(B) Carbon & Carbon
(C) Carbon & Sulphur
(D) Carbon & Hydrogen
2. The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is
known as
(A) Brownian motion
(B) Zig Zag Motion
(C) evaporation
(D) liquefaction
3. Which of the following is an acidic salt?
(A) NaHSO4
(B) Na2SO4
(C) CH3CO2Na
(D) Na2S


4. Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron (III)
oxide will be contained in 1kg of the compound?
(A) 12.5moles
(B) 0.625moles
(C) 25moles  
(D) 6.25moles
5. 3.0g of a mixture of potassium carbonate and potassium chloride were dissolved in a 250cm3
standard flask. 25cm3 of this solution required 40.00cm3 of 0.01M HCl for neutralization. What is the
percentage by weight of k2CO3 in the mixture? (k = 39, O = 16, C = 12)
(A) 92
(B) 89
(C) 72
(D) 82
6. 0.499g of CuSO4.XH2O when heated to constant weight gave a residue of 0.346g. What is the value
of X?  
(A) 2.0
(B) 3.0
(C) 5.0
(D) 4.0
7. The principal constituents of natural gas is
(A) methane
(B) ethane
(C) propane
(D) butane
8. Which of the following gases can be collected by the method of downward delivery?
(A) chlorine
(B) oxygen
(C) ammonia
(D) hydrogen
9. A mixture of sugar and sulphur can be separated by
(A) dissolution in water, evaporation and filtration
(B) filtration, evaporation and dissolution in water
(C) dissolution in water, filtration and evaporation
(D) evaporation, dissolution in water and filtration
10. The percentage of water of crystallization in ZnSO4. 7H2O is
(A) 33%
(B) 44%
(C) 55%
(D) 87%
11. When a solution of silver (I) nitrate is saturated with hydrogen sulphide, a black precipitate forms
which is
(A) H2S
(B) Ag2S
(C) PbS
(D) HNO3
12. 0.0075 mole of calcium trioxocarbonate (iv) is added to 0.015 mole of a solution of HCl. The volume
of gas evolved at S.T.P is
(A) 224cm3
(B) 168cm3
(C) 112cm3
(D) 100cm3
13. The weakest attractive force that can be observed between two molecules is
(A) ionic
(B) covalent
(C) coordinates
(D) van der waals forces


14. Which quantum number divides shells into orbitals?
(A) Principal
(B) azimuthally
(C) magnetic
(D) spin
15. The major source of oxides of nitrogen is from the burning of
(A) coal
(B) wood
(C) fuel
(D) chlorofluorocarbons.
16. Cotton is almost pure
(A) starch
(B) protein
(C) animal fibre
(D) cellulose
17. Lucas reagent is used to test for
(A) alkanes
(B) alkanoic acids
(C) alkanols
(D) amines
18. An element X forms the following compounds with chlorine: XCl4, XCl3, XCl2. This illustrate the
(A) law of multiple proportions
(B) law of definite proportions
(C) law of conservation of mass
(D) law of chemical proportions
19. The molecular formula of a common organic laboratory anesthetic is
(A) CHCl3
(B) CHI3
(C) CCl4
(D) CHF3
20. Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have
(A) a single bond
(B) double bond
(C) a triple bond
(D) an ionic bond
21. Copper metal dissolves in concentrated trioxonitrate (v) acid with the resultant evolution of
(A) CO2
(B) SO2
(C) NO2
(D) CO
22. Which of the following is not a member of the homologous series of the paraffins?
(A) C3H8
(B) C5H12
(C) C15H32
(D) C24H48
23. Element P, Q, R and S have 6, 11, 15 and 16 electrons respectively, therefore,
(A) p will form an ionic bond with R
(B) R will form an electrovalent bond with S
(C) Q will form a covalent bond with S  
(D) Q will form an electrovalent bond with S
24. A gaseous mixture of 80.0g of oxygen and 56.0g of nitrogen has a total pressure of 1.8atm. The
partial pressure of oxygen in the mixture is
(A) 0.8atm
(B) 1.0atm
(C) 1.2atm
(D) 1.4atm
25. Palm wine turns sour with time because
(A) the sugar content is converted into alcohol
(B) the CO2 formed during the fermentation process has a sour taste
(C) it is commonly adulterated by the tappers and sellers
(D) microbiological activity results in the production of organic acids within it.
26. Alkanals can be differentiated from alkanones by reaction with
(A) 2, 4 – dinitrophenylhydrazine
(B) hydrogen cyanide
(C) sodium hydrogen sulphite
(D) TolleŶ͛s ƌeageŶt


27. The following are uses of sulphur except
(A) vulcanization of rubber
(B) manufacture of dyes
(C) coating of steel to prevent rusting
(D) manufacture of tetraoxosulphate (VI) acid.
28. Catalytic hydrogenation of benzene produces
(A) an aromatic hydrogenation
(B) margarine
(C) cyclohexane
(D) benzene
29. The oxidation number of chlorine is +1in
(A) KClO3
(B) Cl2O7
(C) ZnCl2
(D) NaClO
30. The carbon atoms on ethane are
(A) Sp2 hybridised
(B) SP hybridized
(C) SP3 hybridised
(D) SP2d hybridized
31. At 25oC and 1atm, a gas occupies a volume of 1.50dm3. What volume will it occupy at 100 oC
and 1atm?
(A) 1.88dm3
(B) 6.00dm3  
(C) 18.80dm3  
(D) 60.0dm3
32. A current of 4.0 amperes was passed through copper (II) tetraoxosulphate (IV) solution for one
hour using copper electrodes. What was the mass of copper deposited? (Cu =64, IF = 96500C)
(A) 3.2g
(B) 4.8g
(C) 6.4g
(D) 96
33. Pauli exclusion principle is related to
(A) quantum numbers of electrons
(B) reversibility of equilibrium reactions
(C) electronegativity values of elements  
(D) collision theory of reactions rate
34. Esterification of propane 1, 2, 3-triol and unsaturated higher carboxylic acids will produce  
(A) fats
(B) soap
(C) alkanols
(D) methyl propanoate
35. The greenhouse effect is a climatic condition associated with the presence of excess
(A) CO2
(B) H2S
(C) NO
(D) NH3
36. The metal extracted from cassiterite is
(A) calcium
(B) copper
(C) tin
(D) sodium
37. The following are uses of sulphur except
(A) vulcanization of rubber
(B) manufacture of dyes
(C) coating of steel to prevent rusting
(D) manufacture of tetraoxosulphate (VI) acid
38. Equilibrium is sad to be attained in a reversible reaction when
(A) all the reactants have been used up
(B) all the products have been formed
(C) there is no further change in temperature
(D) the rate of forward and backward reactions are equal
39. The greenhouse effect is a climatic condition associated with the presence of excess
(A) CO2
(B) H2S
(C) NO
(D) NH3
40. The following uses radioactive isotopes except for
(A) sterilization of medical equipment
(B) tracing reaction paths
(C) dating elements
(D) determining equilibrium positions
41. Which of the following is needed to produce a slag during the extraction of iron in the blast
furnace?
(A) cryolite
(B) limestone
(C) carbon
(D) sulphur
42. Calcium atom ionizes by  
(A) gaining two electrons
(B) losing two electrons
(C) sharing two electrons
(D) gaining two  proton


43. In the Periodic Table, the elements that lose electrons most readily belong to
(A) group IA
(B) group IIA
(C) group IIIA
(D) group VIIA
44. Which of the following halogens is the most reactive?  
(A) F2
(B) Br2
(C) Cl2
(D) I2  
45. Which of the following substances increases in mass when heated in air?
(A) sodium chloride
(B) iodine crystals
(C) magnessium ribon
(D) copper (ii) oxide
46. Which of the following properties increases down a group in the Periodic Table
(A) atomic radius
(B) electronegativity
(C) electron affinity
(D) ionization energy
47. Which of the following types of reactions takes place between C2H4 and the halogens?
(A) Substitution
(B) Addition
(C) polymerization
(D) Oxidation
48. An amphoteric oxide is an
(A) amorphorous oxide of a metal
(B) amorphorous oxide of a non-metal
(C) Oxide that is insoluble in water
(D) Oxide that behaves as a base as well as an acid
49. What weight of sodium hydroxide is required to make 500cm3 of 0.2M solution?
(A) 40g
(B) 20g
(C) 10g
(D) 4g
50. The IUPAC names for the compounds CH3COOH and CH2 = CH2 are respectively;  
(A) acetic acid and ethane
(B) ethanoic acid and ethene
(C) methanoic acid and ethylene
(D) acetic acid and ethene


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