Chemistry, 1998, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

1998

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

11 - 20 of 38 Questions

#	Question	Ans
11.	The property used in obtaining oxygen and nitrogen industrially from air is the? A. boiling point B. density C. rate of diffusion D. solubility	A
12.	Potassium tetraoxomanganate (VII) is often added to impure water to? A. reduce organic impurities B. reduce inorganic impurities C. destroy bacteria and algae D. remove permanent hardness Show Content Detailed Solution Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water. It can also be used to control iron bacteria growth in wells.	C
13.	The soil around a battery manufacturing factory is likely to contain a high concentration of? A. Ca²⁺ salts B. Pb²⁺ salts C. Mg²⁺ salts D. Al³⁺ salts	B
14.	Excess phosphorus was burnt in a gas jar and the residual gas passed successively over concentrated KOH solution and concentration H₂SO₄ before being collected in a flask. The gases collected are? A. carbon (IV) oxide, nitrogen and the rare gases B. nitrogen and the rare gases C. carbon (IV) oxide, nitrogen (IV) oxide and the rare gases D. carbon (IV) oxide	C
15.	If an element X of an atomic number Z and mass number Y is irradiated by an intense concentration of neutrons, the relevant nuclear equation is? A. ^y_zX + ¹₀n → ^{y - 1}_{z + 1}X B. ^y_zX + ¹₀n → ^{y + 1}_zX C. ^y_zX + ¹₀n → ^y_{z + 1}X D. ^y_zX + ¹₀n → ^{y + 1}_{z - 1}X	B
16.	90.0g of MgCI₂ was placed in 50.0cm³ of water to give a saturated solubility of the salt is 8.0 mol dm³ at the same temperature, what is the mass of the salt left undissolved at the given temperature? (Mg = 24, Cl = 35.5) A. 52.0g B. 58.5g C. 85.5g D. 88.5g Show Content Detailed Solution Molar mass of MgCl₂ = 95g The solubility of MgCl₂ is 8.0/dm³ 1 dm³ = 1000cm³ Solubility of g/cm³ 8 x 95 → 1000cm³ x → 50 x = (50)/(1000) x (8 x 95) / (1) = 38g Mass of the salt left undissolved = 90 - 38 = 52.0g	A
17.	Soap lather is an example of a colloid in which a? A. liquid is dispersed in gas B. solid is dispersed in liquid C. gas is dispersed in liquid D. liquid is despersed in liquid	C
18.	The pH of a solution obtained by mixing 100cm³ of a 0.2M solution of NaOH is? A. 1.3 B. 7.0 C. 9.7 D. 12.7	D
19.	Mg²⁺_(aq) + 2e^->_(aq) → Mg_(s)E°_(volts) = 2.370 Zn²⁺_(aq) + 2e^->_(aq) → Zn_(s)E°_(volts) = -0.763 Cds²⁺_(aq) + 2e^-& A. Cu _(s) B. Cd_(s) C. Znsub>(s) D. Mg_(s)	D
20.	2Cl^2(g) + 2H₂O_(g) 4HCl_(g) + O_2(g) ∆H° = +115KJ mol^-1. In the above equilibrium reaction, a decrease in temperature will? A. favour the reverse reaction B. favour the forward reaction C. have no effect on the equilibrium state D. double the rate of the reverse raection	A

11.	The property used in obtaining oxygen and nitrogen industrially from air is the? A. boiling point B. density C. rate of diffusion D. solubility	A
12.	Potassium tetraoxomanganate (VII) is often added to impure water to? A. reduce organic impurities B. reduce inorganic impurities C. destroy bacteria and algae D. remove permanent hardness Show Content Detailed Solution Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water. It can also be used to control iron bacteria growth in wells.	C
13.	The soil around a battery manufacturing factory is likely to contain a high concentration of? A. Ca²⁺ salts B. Pb²⁺ salts C. Mg²⁺ salts D. Al³⁺ salts	B
14.	Excess phosphorus was burnt in a gas jar and the residual gas passed successively over concentrated KOH solution and concentration H₂SO₄ before being collected in a flask. The gases collected are? A. carbon (IV) oxide, nitrogen and the rare gases B. nitrogen and the rare gases C. carbon (IV) oxide, nitrogen (IV) oxide and the rare gases D. carbon (IV) oxide	C
15.	If an element X of an atomic number Z and mass number Y is irradiated by an intense concentration of neutrons, the relevant nuclear equation is? A. ^y_zX + ¹₀n → ^{y - 1}_{z + 1}X B. ^y_zX + ¹₀n → ^{y + 1}_zX C. ^y_zX + ¹₀n → ^y_{z + 1}X D. ^y_zX + ¹₀n → ^{y + 1}_{z - 1}X	B

16.	90.0g of MgCI₂ was placed in 50.0cm³ of water to give a saturated solubility of the salt is 8.0 mol dm³ at the same temperature, what is the mass of the salt left undissolved at the given temperature? (Mg = 24, Cl = 35.5) A. 52.0g B. 58.5g C. 85.5g D. 88.5g Show Content Detailed Solution Molar mass of MgCl₂ = 95g The solubility of MgCl₂ is 8.0/dm³ 1 dm³ = 1000cm³ Solubility of g/cm³ 8 x 95 → 1000cm³ x → 50 x = (50)/(1000) x (8 x 95) / (1) = 38g Mass of the salt left undissolved = 90 - 38 = 52.0g	A
17.	Soap lather is an example of a colloid in which a? A. liquid is dispersed in gas B. solid is dispersed in liquid C. gas is dispersed in liquid D. liquid is despersed in liquid	C
18.	The pH of a solution obtained by mixing 100cm³ of a 0.2M solution of NaOH is? A. 1.3 B. 7.0 C. 9.7 D. 12.7	D
19.	Mg²⁺_(aq) + 2e^->_(aq) → Mg_(s)E°_(volts) = 2.370 Zn²⁺_(aq) + 2e^->_(aq) → Zn_(s)E°_(volts) = -0.763 Cds²⁺_(aq) + 2e^-& A. Cu _(s) B. Cd_(s) C. Znsub>(s) D. Mg_(s)	D
20.	2Cl^2(g) + 2H₂O_(g) 4HCl_(g) + O_2(g) ∆H° = +115KJ mol^-1. In the above equilibrium reaction, a decrease in temperature will? A. favour the reverse reaction B. favour the forward reaction C. have no effect on the equilibrium state D. double the rate of the reverse raection	A