2011 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS Leave a Comment / Jamb Chemistry / By Jamb Tutor Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Created by Jamb TutorJamb Chemistry 2011 JAMB CHEMISTRY PAST QUESTIONS AND ANSWERS 1 / 34 Category: Jamb Chemistry 2011 1. Which question Paper Type of Chemistry is given to you? a) Type C b) Type D c) Type A d) Type B The question Paper Type refers to the unique code for each exam version, helping candidates identify the exact questions they answered. 2 / 34 Category: Jamb Chemistry 2011 2. What is the concentration of a solution containing 2g of NaOH in 100 $\text{cm}^3$ of solution? [Na = 23, O = 16, H = 1] a) $0.40 , \text{mol dm}^{-3}$ b) $0.50 , \text{mol dm}^{-3}$ c) $0.05 , \text{mol dm}^{-3}$ d) $0.30 , \text{mol dm}^{-3}$ Calculate molar mass of NaOH = 23 + 16 + 1 = 40. Molarity = $\frac{2}{40 \times 0.1} = 0.5 , \text{mol dm}^{-3}$. 3 / 34 Category: Jamb Chemistry 2011 3. Which of the following properties is NOT peculiar to matter? a) Kinetic energy of particles increases from solid to gas b) Random motion of particles increases from liquid to gas c) Orderliness of particles increases from gas to liquid d) Random motion of particles increases from gas to solid Orderliness of particles is not peculiar to matter, as it varies based on state. In gases, particles are randomly arranged and in constant motion. 4 / 34 Category: Jamb Chemistry 2011 4. The principle of column chromatography is based on the ability of the constituents to a) Move at different speeds in the column b) Dissolve in each other in the column c) React with the solvent in the column d) React with each other in the column In chromatography, components move at different speeds along the column, allowing separation based on their interactions with the stationary and mobile phases. 5 / 34 Category: Jamb Chemistry 2011 5. From the diagram above, an ideal gas can be represented by a) M b) N c) K d) L An ideal gas exhibits low attraction between molecules and obeys gas laws under standard conditions. 6 / 34 Category: Jamb Chemistry 2011 6. Which of the following statements is correct about the periodic table? a) Non-metallic properties decrease across each period b) Valence electrons increase progressively across the period c) Elements in the same group have the same number of shells d) Elements in the same period have the same valence electrons In the periodic table, valence electrons increase progressively across a period, determining chemical properties. 7 / 34 Category: Jamb Chemistry 2011 7. The relative atomic mass of a naturally occurring lithium consisting of 90% Li and 10% Li is a) 6.9 b) 7.1 c) 6.2 d) 6.8 The relative atomic mass is calculated by weighted average: $(0.9 \times 6.9) + (0.1 \times 7.1) = 6.9$ 8 / 34 Category: Jamb Chemistry 2011 8. An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is a) 16 b) 15 c) 46 d) 31 Protons are equal to the atomic number, so this isotope has 15 protons. 9 / 34 Category: Jamb Chemistry 2011 9. The molecular lattice of iodine is held together by a) Dative bond b) Metallic bond c) Hydrogen bond d) Van der Waals forces Van der Waals forces hold iodine molecules in a lattice, allowing them to form solid structures with weak attractions. 10 / 34 Category: Jamb Chemistry 2011 10. The arrangement of particles in crystal lattices can be studied using a) X-rays b) γ-rays c) α-rays d) β-rays X-ray diffraction helps study crystal structures by measuring diffraction patterns of X-rays through the lattice. 11 / 34 Category: Jamb Chemistry 2011 11. From the diagram above, find the amount of solute deposited when 200 $\text{cm}^3$ of the solution is cooled from $55^\circ\text{C}$ to $40^\circ\text{C}$ a) 0.10 mol b) 0.20 mol c) 0.01 mol d) 0.02 mol Based on the solubility curve, cooling results in crystallization of solute. The deposited amount corresponds to 0.20 mol. 12 / 34 Category: Jamb Chemistry 2011 12. The importance of sodium aluminate (III) in the treatment of water is to a) Cause coagulation b) Neutralize acidity c) Prevent goitre and tooth decay d) Kill germs Sodium aluminate causes coagulation by aggregating suspended particles in water, enabling easier filtration. 13 / 34 Category: Jamb Chemistry 2011 13. What type of bond exists between an element X with atomic number 12 and Y with atomic number 17? a) Electrovalent b) Metallic c) Covalent d) Dative Element X (magnesium) and element Y (chlorine) form an ionic bond, as X donates electrons to Y. 14 / 34 Category: Jamb Chemistry 2011 14. Hardness of water is mainly due to the presence of a) Calcium hydroxide or magnesium hydroxide b) Calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI) c) Sodium hydroxide or magnesium hydroxide d) Calcium chloride or sodium chloride salts Hard water is caused by calcium and magnesium ions, particularly as carbonates and sulfates. 15 / 34 Category: Jamb Chemistry 2011 15. A suitable solvent for iodine and naphthalene is a) Carbon (IV) sulphide b) Ethanol c) Water d) Benzene Nonpolar solvents like benzene dissolve iodine and naphthalene effectively due to similar intermolecular forces. 16 / 34 Category: Jamb Chemistry 2011 16. Which of the following noble gases is commonly found in the atmosphere? a) Xenon b) Neon c) Helium d) Argon Argon is the third most abundant gas in the atmosphere after nitrogen and oxygen, contributing about 1%. 17 / 34 Category: Jamb Chemistry 2011 17. In the reaction $\text{N}_2\text{O}_4(\text{g}) \leftrightarrow 2\text{NO}_2(\text{g}) \quad \Delta H = +\text{ve}$, an increase in temperature will a) Increase the value of the equilibrium constant b) Decrease the value of the equilibrium constant c) Increase reactant production d) Shift equilibrium to the left Endothermic reactions favor product formation at higher temperatures, shifting the equilibrium to the right. 18 / 34 Category: Jamb Chemistry 2011 18. In the reaction $\text{CH}_3\text{COOH}(\text{aq}) + \text{OH}^- \rightarrow \text{CH}_3\text{COO}^-(\text{aq}) + \text{H}_2\text{O}(\text{l})$, the conjugate base is a) Conjugate base b) Acid c) Base d) Conjugate acid $\text{CH}_3\text{COO}^-$ is the conjugate base of acetic acid ($\text{CH}_3\text{COOH}$) in the reaction. 19 / 34 Category: Jamb Chemistry 2011 19. The maximum number of isomers for $\text{C}4\text{H}{10}$ is a) 3 b) 4 c) 1 d) 2 Butane has two isomers: n-butane (straight chain) and isobutane (branched chain). 20 / 34 Category: Jamb Chemistry 2011 20. The reaction $\text{CH}_3\text{COOH} + \text{C}_2\text{H}_5\text{OH} \rightarrow \text{CH}_3\text{COOC}_2\text{H}_5 + \text{H}_2\text{O}$ is an example of a) Esterification b) Condensation c) Saponification d) Neutralization This is an esterification reaction where an acid reacts with an alcohol to form an ester and water. 21 / 34 Category: Jamb Chemistry 2011 21. The functional groups present in the compound above are a) Alkene and halo-group b) Hydroxyl and chloro-group c) Alkene and chloro-group d) Hydroxyl and halo-group The compound contains an alkene and a chloro-group as functional groups. 22 / 34 Category: Jamb Chemistry 2011 22. The reaction $\text{C}6\text{H}{12}\text{O}_6 \rightarrow 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2$ is used to produce a) Propanol b) Butanol c) Methanol d) Ethanol This fermentation reaction produces ethanol and carbon dioxide, commonly used in the beverage industry. 23 / 34 Category: Jamb Chemistry 2011 23. The bleaching action of chlorine gas is effective due to the presence of a) Hydrogen chloride b) Water c) Air d) Oxygen Water is necessary for the bleaching action of chlorine gas, as it forms hypochlorous acid, which acts as the bleaching agent. 24 / 34 Category: Jamb Chemistry 2011 24. Dried oxygen is usually collected over a) Hydrochloric acid b) Mercury c) Calcium chloride d) Tetraoxosulphate (VI) acid In the laboratory, dried oxygen is collected over mercury to prevent contamination by water. 25 / 34 Category: Jamb Chemistry 2011 25. The property of concentrated $\text{H}_2\text{SO}_4$ that makes it suitable for preparing $\text{HNO}_3$ is its a) Boiling point b) Density c) Oxidizing properties d) Dehydrating properties Concentrated $\text{H}_2\text{SO}_4$ is a dehydrating agent, which removes water during $\text{HNO}_3$ preparation. 26 / 34 Category: Jamb Chemistry 2011 26. Bronze is preferred to copper in the making of medals because it a) Is stronger b) Can withstand low temperature c) Is lighter d) Has low tensile strength Bronze is an alloy that is stronger and more durable than pure copper, making it ideal for medals. 27 / 34 Category: Jamb Chemistry 2011 27. The constituents of baking powder that make dough rise is a) $\text{NaHCO}_3$ b) NaOH c) $\text{Na}_2\text{CO}_3$ d) NaCl Baking powder contains $\text{NaHCO}_3$, which releases carbon dioxide when heated, causing dough to rise. 28 / 34 Category: Jamb Chemistry 2011 28. Which of the following compounds is used as a gaseous fuel? a) $\text{CH}_3\text{-C} \equiv \text{CH}$ b) $\text{CH}_3\text{-CH}_2\text{-CH}_3$ c) $\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-COOH}$ d) $\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_3$ $\text{CH}_3\text{-C} \equiv \text{CH}$ (ethyne) is used as a gaseous fuel due to its high energy release during combustion. 29 / 34 Category: Jamb Chemistry 2011 29. The ability of carbon to form long chains is referred to as a) Alkylation b) Acylation c) Catenation d) Carbonation Catenation is the ability of carbon atoms to bond with one another to form long chains and complex structures. 30 / 34 Category: Jamb Chemistry 2011 30. Which of the following compounds will undergo polymerization reaction? a) $\text{C}_2\text{H}_4$ b) $\text{C}_2\text{H}_5\text{COOH}$ c) $\text{C}_2\text{H}_6$ d) $\text{C}_2\text{H}_5\text{OH}$ $\text{C}_2\text{H}_4$ (ethene) undergoes polymerization to form polyethylene, a widely used plastic. 31 / 34 Category: Jamb Chemistry 2011 31. The compound above exhibits a) Geometric isomerism b) Optical isomerism c) Structural isomerism d) Positional isomerism Geometric isomerism occurs in compounds with restricted rotation around a double bond, resulting in different spatial arrangements. 32 / 34 Category: Jamb Chemistry 2011 32. An organic compound has an empirical formula $\text{CH}_2\text{O}$ and vapor density of 45. The molecular formula is a) $\text{C}_3\text{H}_7\text{OH}$ b) $\text{C}_2\text{H}_5\text{OH}$ c) $\text{C}_3\text{H}_6\text{O}_3$ d) $\text{C}_2\text{H}_4\text{O}_2$ The molar mass of $\text{CH}_2\text{O}$ is 30. Molecular formula = empirical formula × 1.5 = $\text{C}_3\text{H}_6\text{O}_3$. 33 / 34 Category: Jamb Chemistry 2011 33. Two organic compounds K and L were treated with Fehling’s solution. K formed a brick red precipitate while L remained unaffected. K is an a) Alkanol b) Alkane c) Alkanal d) Alkanone Aldehydes (alkanals) react with Fehling’s solution, forming a brick red precipitate. Alkanones do not. 34 / 34 Category: Jamb Chemistry 2011 34. Which of the following is true about 2-methylpropane and butane? a) They are members of the same homologous series b) They have the same boiling point c) They have different numbers of carbon atoms d) They have the same chemical properties Both are alkanes and share similar chemical properties as members of the same homologous series. Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
