Chemistry, 1999, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

1999

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

11 - 20 of 49 Questions

#	Question	Ans
11.	The method that can be used to convert hard water to soft water is A. chlorination B. passage over activated charcoal C. the use of an ion-exchange resin D. aeration	C
12.	1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁷, 4s² An element with the electronic configuration above is a A. non-metal B. metal C. transition element D. group two element	C
13.	Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond? A. HF_(g) B. NH_3(g) C. CH_4(g) D. HCl_(g)	A
14.	0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50 dm³. If 15.0 cm³ of the solution requires 12.50 cm³ of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution A. 0.30 mol dm³ B. 0.40 mol dm³ C. 0.50 mol dm³ D. 0.60 mol dm³ Show Content Detailed Solution M₁ V₁ = M₂ V₂ ∴ M_n V_n represent volume and molar concentration of HCL also MyVy represent volume and molar concentration of Na₂CO₃ M_nV_n = MyVy 0.25 * 15 = 12.50 * My My = (0.25 * 15)/12.50 My = 0.3m/dm³	A
15.	The correct order of increasing oxidation number of the transition metal ions for the compounds K₂Cr₂O₇, V₂O₅ and KMnO₄ is A. V₂O₅ < K₂Cr₂O₇ < KMnO₄ B. K₂Cr₂O₇ < KMnO₄ < V₂O₅ C. KMnO₄ < K₂Cr₂O₇ < V₂O₅ D. KMnO₄ < V₂O₅ < K₂Cr₂O₇	A
16.	The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is A. CO, CO² and SO² B. CO, HCL and SO² C. CO, CO² and HCL D. SO², CO² and HCL	B
17.	What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together? A. A white precipitate is formed B. A green precipitate is formed C. The mixture remains colourless D. The mixture turns reddish brown	D
18.	The solution with the lowest pH value is A. 5 ml of (m/10) HCL B. 10 ml of (m/10) HCL C. 15 ml of (m/5) HCL D. 20 ml of (m/8) HCL	A
19.	The solubility product of Cu(IO₃)₂ is 1.08 * 10^-7. Assuming that neither ions react appreciable with water to form H⁺ and OH^-, what is the solubility of this salt? A. 2.7 * 10^-8 mol dm^-3 B. 9.0 * 10^-8 mol dm^-3 C. 3.0 * 10^-3 mol dm^-3 D. 9.0 * 10^-3 mol dm^-3	D
20.	The entropy and enthalpy of a system are a measure of A. degree of disorderlinesss and heat content respectively B. heat content and degree of disorderliness respectively C. heat content of a system only D. degree of disorderliness only	A

11.	The method that can be used to convert hard water to soft water is A. chlorination B. passage over activated charcoal C. the use of an ion-exchange resin D. aeration	C
12.	1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁷, 4s² An element with the electronic configuration above is a A. non-metal B. metal C. transition element D. group two element	C
13.	Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond? A. HF_(g) B. NH_3(g) C. CH_4(g) D. HCl_(g)	A
14.	0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50 dm³. If 15.0 cm³ of the solution requires 12.50 cm³ of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution A. 0.30 mol dm³ B. 0.40 mol dm³ C. 0.50 mol dm³ D. 0.60 mol dm³ Show Content Detailed Solution M₁ V₁ = M₂ V₂ ∴ M_n V_n represent volume and molar concentration of HCL also MyVy represent volume and molar concentration of Na₂CO₃ M_nV_n = MyVy 0.25 * 15 = 12.50 * My My = (0.25 * 15)/12.50 My = 0.3m/dm³	A
15.	The correct order of increasing oxidation number of the transition metal ions for the compounds K₂Cr₂O₇, V₂O₅ and KMnO₄ is A. V₂O₅ < K₂Cr₂O₇ < KMnO₄ B. K₂Cr₂O₇ < KMnO₄ < V₂O₅ C. KMnO₄ < K₂Cr₂O₇ < V₂O₅ D. KMnO₄ < V₂O₅ < K₂Cr₂O₇	A

16.	The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is A. CO, CO² and SO² B. CO, HCL and SO² C. CO, CO² and HCL D. SO², CO² and HCL	B
17.	What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together? A. A white precipitate is formed B. A green precipitate is formed C. The mixture remains colourless D. The mixture turns reddish brown	D
18.	The solution with the lowest pH value is A. 5 ml of (m/10) HCL B. 10 ml of (m/10) HCL C. 15 ml of (m/5) HCL D. 20 ml of (m/8) HCL	A
19.	The solubility product of Cu(IO₃)₂ is 1.08 * 10^-7. Assuming that neither ions react appreciable with water to form H⁺ and OH^-, what is the solubility of this salt? A. 2.7 * 10^-8 mol dm^-3 B. 9.0 * 10^-8 mol dm^-3 C. 3.0 * 10^-3 mol dm^-3 D. 9.0 * 10^-3 mol dm^-3	D
20.	The entropy and enthalpy of a system are a measure of A. degree of disorderlinesss and heat content respectively B. heat content and degree of disorderliness respectively C. heat content of a system only D. degree of disorderliness only	A