General Chemistry I — 2025 Past Questions

Lagos State University CHM102: 35 questions.

Topics: Chemistry of selected metals and non-metals, Chemistry of alkanes, alkenes, alkynes, alcohols, ethers, amines, alkyl halides, nitriles, aldehydes, ketones, carboxylic acids, and derivatives, Electronic theory in organic chemistry, Comparative chemistry of group IA, IIA, and IVA elements, Nomenclature and functional group classes of organic compounds, Stereochemistry, Introductory reaction mechanisms and kinetics, Introduction to transition metal chemistry, Fullerenes as the fourth allotrope of carbon (nanotubules, nanostructures, nanochemistry), Historical survey of organic chemistry development, Isolation, purification, and determination of organic compound structures

1. The structure of C60 is called as ______
   1. Isohedron
   2. Truncated isohedron
   3. Trigonal
   4. Trigonal Bipyramidal
2. Hydroboration-oxidation of terminal alkynes is for ______
   1. Ketone
   2. Aldehyde
   3. Nitriles
   4. None of the above
3. What are the total valence electrons and shape of NCl3?
   1. 24; Octahedral
   2. 16; Linear
   3. 26; Tetrahedral
   4. 26; Pyramid
4. What is the difference between an integer and a float?
   1. Integers are whole numbers, floats are numbers with decimals
   2. Floats are whole numbers, integers are numbers with decimals
   3. There is no difference between integers and floats
   4. Integers are letters, floats are numbers
5. 3-Bromo-pentan-2-amine is an example of ______
   1. Quaternary amine
   2. Tertiary amine
   3. Secondary amine
   4. Primary amine
6. Dehydration of an alcohol leads to the formation of
   1. Alkane
   2. Alkene
   3. Alkyne
   4. Alkyl halide
7. What is the electronic configuration of 8 elements in periods 6-7 of the transition series?
   1. [noble gas]ns2(n-2)dx
   2. [noble gas]ns2(n-1)dx
   3. (ns2(n-2)dx
   4. [noble gas]ns2(n-2)f14(n-1)dx
8. Which of the following is true in terms of electronegativity?
   1. Fluorine < Astatine
   2. Fluorine > Astatine
   3. Astatine > Iodine
   4. Iodine > Bromine
9. Which of the following metals has the lowest melting point?
   1. Ca
   2. Li
   3. Pb
   4. Al
10. The synthesis of an organic compound from inorganic compounds was discovered by which scientist?
    1. August Kekule
    2. Antoine Lavoisier
    3. Friedrich Wohler
    4. Archibald S. Couper
11. All the elements in group IVA show allotropy except
    1. C
    2. Si
    3. Sn
    4. Pb
12. What is the structure of ester formed from propanoic acid and ethanol?
    1. Ethyl propanoate (CH3CH2COOCH2CH3)
    2. Methyl propanoate (CH3CH2COOCH3)
    3. Propyl methanoate (HCOOCH2CH2CH3)
    4. Ethyl methanoate (HCOOCH2CH3)
13. A X color precipitate, which is Y in ammonium hydroxide indicates presence of chlorine. Identify X and Y.
    1. X = white, Y = insoluble
    2. X = white, Y = soluble
    3. X = yellowish, Y = insoluble
    4. X = yellowish, Y = soluble
14. What is the order of the reaction whose rate equation is expressed as: R = k[CH4]^{1/2}[Cl2]^{3/2}
    1. Zero order
    2. First order
    3. Second order
    4. Fractional order
15. The carbon of an organic compound which has all its four attachments different is called
    1. Enantiomers
    2. Chiral
    3. Mirror image carbon
    4. Gamma carbon
16. Which of the following is likely to act as an electrophile?
    1. Cl₂
    2. OH⁻
    3. NO₂⁺
    4. NH₃
17. The relative molecular mass of 3-methylbutanol is (C=12, H=1, O=16)
    1. 105
    2. 84
    3. 100
    4. 73
18. The organic starting materials for the preparation of an ester are:
    1. Only acid
    2. Ketone and alcohol
    3. Alkane and ketone
    4. Acid and alcohol
19. The type of bond breaking that involves the uneven breaking of covalent bond is referred to as
    1. Homolytic fission
    2. Heterolytic fission
    3. Nucleophilic fission
    4. Electrophilic fission
20. Ketone can be prepared by the oxidation of ---
    1. Tertiary alcohol
    2. Secondary alcohol
    3. Primary alcohol
    4. High percent alcohol
21. Which of the following is false?
    1. Main group compounds are ionic, colourless and diamagnetic
    2. Transition element compounds are coloured and paramagnetic
    3. Transition elements are metals, metalloids and non-metals
    4. Period 7 of the transition series are hardly discussed because they are radioactive
22. The order of a reaction which helps in understanding a reaction mechanism is known as
    1. Order of reaction
    2. Molecularity of reaction
    3. Rate of reaction
    4. Pathway of reaction
23. Which of the following statements give the acceptable structure of Benzene?
    1. Benzene yield monosubstituted product
    2. Benzene yields only three disubstitution compound
    3. All of the above
    4. None of the above
24. Which of the statement is incorrect?
    1. M4+ compounds of group IVA behave as a covalent
    2. M2+ compounds of group IVA behave as an ionic
    3. M4+ ions of group IVA are larger than M2+
    4. M4+ of group IVA are smaller than M2+
25. Which of the following IUPAC nomenclature matched the name of the compound below? [Benzene ring with COOH at position 1, OCH3 at position 2, NO2 at position 4]
    1. 2-methoxy-4-nitro-benzoic acid
    2. 2-nitro-4-methoxy-benzoic acid
    3. 4-methoxy-2-nitro-benzoic acid
    4. None of the above
26. Which of the statement is incorrect?
    1. M4+ compounds of group IVA behave as a covalent
    2. M2+ compounds of group IVA behave as an ionic
    3. M4+ ions of group IVA are larger than M2+
    4. M4+ of group IVA are smaller than M2+
27. --- is the field of chemistry that deals with the structures of molecules in three dimensions.
    1. Stereochemistry
    2. Geochemistry
    3. Analytical chemistry
    4. Electrochemistry
28. Identify the element that cannot be detected by Lassaigne's test.
    1. Fluorine
    2. Phosphorus
    3. Nitrogen
    4. Sulphur
29. What is the structure of fullerene?
    1. Simple molecular
    2. Macromolecular (giant covalent)
    3. Giant ionic
    4. Giant metallic
30. Which of the following metallic ores requires roasting process?
    1. PbS
    2. Fe3O4
    3. Al2O3
    4. TiO2
31. Which of the following chemists proposed the 'Vitalism theory'?
    1. August Kekule
    2. Antoine Lavoisier
    3. Friedrich Wohler
    4. Jöns Jacob Berzelius
32. All compounds consist of particular atoms in their molecules or group of atoms called
    1. Function group
    2. Atomic group
    3. Functional group
    4. Atomic number
33. How many electrons are in the outer principal quantum shell of bromine?
    1. 2
    2. 5
    3. 7
    4. 3
34. What is the bond order of O2^2-?
    1. 1
    2. 2
    3. 3
    4. 6
35. Cis-trans isomers and optical isomers are two kinds of ______
    1. Constitutional isomer
    2. Configurational
    3. Conformational isomers
    4. Transfiguration isomer

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