Chemistry, 2003, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2003

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

21 - 30 of 48 Questions

#	Question	Ans
21.	If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at A. High temperature B. Any temperature C. Low temperature D. Minimum temperature	A
22.	The commonest feature of reactions at the anode is that A. electrons are consumed B. oxidation is involved C. ions are reduced D. electrode dissolves	B
23.	Which of the following will change when a catalyst is added to a chemical reaction? A. The activation energy B. The potential energy of the reactants C. The heat of the reaction D. the potential energy of the product	A
24.	If y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct? A. Y increases in oxidation number B. Y becomes reduced C. Z loses protons D. Z gains protons	B
25.	When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant? A. 2SO_3(g) ↔ 2SO_2(g) + O_2(g) B. 2CO_2(g) ↔ 2CO_(g) + O_2(g) C. 2H_2(g) + O_2(g) ↔ 2H₂O_(g) D. 2NO_(g) ↔ N_2(g) + O_2(g)	C
26.	In the electrolysis of a concentrated solution of sodium chloride using electrodes, which of the following ions are discharged at the cathode and anode respectively? A. Na⁺ and Cl^- B. Na⁺ and OH^- C. H⁺ and OH^- D. H⁺ and Cl^-	D
27.	CO_(g) + H₂O_(g) → CO_2(g) + H_2(g) From the reaction above, calculate the standard enthalpies of formation of CO_2(g), H₂O_(g) and CO_(g) in kJ mol^-1 are -394, -242, and -110 respectively. A. -262 kJ mol^-1 B. -42 kJ mol^-1 C. +42 kJ mol^-1 D. +262 kJ mol^-1 Show Content Detailed Solution CO + H₂O → CO₂ + H₂ DH = 394 kJ mol^-1 -242 + 110 = -352 kJ mol^-1 35 = -394 -(352) = -394 + 352 = -42 kJ mol^-1	B
28.	When sugar is dissolved in tea, the reaction is always accomplished by A. positive change B. negative entropy change C. no entropy change D. a minimum entropy change	C
29.	Which of the following is an electrolyte? A. Alcohol B. Sodium acetate solution C. Solid potassium hydroxide D. Mercury	B
30.	Chlorine gas is prepared in the laboratory by A. adding concentrated hydrochloric acid to solid manganese (IV) oxide B. aciding concentrated tetraoxosulphate (VI) acid to solid sodium chloride C. dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals D. aciding concentrated tetraoxosulphate (VI) acid to hydrochloric acid	A

21.	If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at A. High temperature B. Any temperature C. Low temperature D. Minimum temperature	A
22.	The commonest feature of reactions at the anode is that A. electrons are consumed B. oxidation is involved C. ions are reduced D. electrode dissolves	B
23.	Which of the following will change when a catalyst is added to a chemical reaction? A. The activation energy B. The potential energy of the reactants C. The heat of the reaction D. the potential energy of the product	A
24.	If y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct? A. Y increases in oxidation number B. Y becomes reduced C. Z loses protons D. Z gains protons	B
25.	When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant? A. 2SO_3(g) ↔ 2SO_2(g) + O_2(g) B. 2CO_2(g) ↔ 2CO_(g) + O_2(g) C. 2H_2(g) + O_2(g) ↔ 2H₂O_(g) D. 2NO_(g) ↔ N_2(g) + O_2(g)	C

26.	In the electrolysis of a concentrated solution of sodium chloride using electrodes, which of the following ions are discharged at the cathode and anode respectively? A. Na⁺ and Cl^- B. Na⁺ and OH^- C. H⁺ and OH^- D. H⁺ and Cl^-	D
27.	CO_(g) + H₂O_(g) → CO_2(g) + H_2(g) From the reaction above, calculate the standard enthalpies of formation of CO_2(g), H₂O_(g) and CO_(g) in kJ mol^-1 are -394, -242, and -110 respectively. A. -262 kJ mol^-1 B. -42 kJ mol^-1 C. +42 kJ mol^-1 D. +262 kJ mol^-1 Show Content Detailed Solution CO + H₂O → CO₂ + H₂ DH = 394 kJ mol^-1 -242 + 110 = -352 kJ mol^-1 35 = -394 -(352) = -394 + 352 = -42 kJ mol^-1	B
28.	When sugar is dissolved in tea, the reaction is always accomplished by A. positive change B. negative entropy change C. no entropy change D. a minimum entropy change	C
29.	Which of the following is an electrolyte? A. Alcohol B. Sodium acetate solution C. Solid potassium hydroxide D. Mercury	B
30.	Chlorine gas is prepared in the laboratory by A. adding concentrated hydrochloric acid to solid manganese (IV) oxide B. aciding concentrated tetraoxosulphate (VI) acid to solid sodium chloride C. dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VI) crystals D. aciding concentrated tetraoxosulphate (VI) acid to hydrochloric acid	A