Chemistry, 2008, WASSCE/WAEC MAY/JUNE, Exam, Paper 1 | Objectives

Paper Info

Year :

2008

Title :

Chemistry

Exam :

WASSCE/WAEC MAY/JUNE

Paper 1 | Objectives

11 - 20 of 44 Questions

#	Question	Ans
11.	The force of attraction between covalent molecules is? A. electrostatic attraction B. hydrogen bonding C. ionic force D. van der Waals forces Show Content Detailed Solution Covalent bond involves the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons.	A
12.	What is the mass of 6.02 x 10²⁴ atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10²³ atoms mol^-1] A. 240g B. 24 g C. 2.4g D. 0.24g	A
13.	Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14] A. NH₃ = 17 B. NH₄CI = 53.5 C. NH₄NO₃ = 80 D. (NH₃)₂SO₄ = 132	A
14.	Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14] A. NH₃ = 17 B. NH₄CI = 53.5 C. NH₄NO₃ = 80 D. (NH₃)₂SO₄ = 132	A
15.	If 5.00cm³ of 0.20 mol dm^-3Na₂CO₃ was diluted with distilled water to obtain 250 cm³ solution, what is the concentration of the resulting solution? A. 0.004 mol dm^-3 B. 0.02 mol dm^-3 C. 0.20mol dm^-3 D. 0.40mol dm^-3	A
16.	Consider the reaction represented by the following equation: Zn_(s) + 2HCI_(aq) → ZnCI_2(aq) + H_2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm^-3] A. 1.12 dm³ B. 2.24dm³ C. 4.48dm³ D. 8.96dm³	A
17.	Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35] A. Chlorine B. Hydrogen C. Neon D. Oxygen	A
18.	In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the A. number of the collisions between the gas molecules and the walls of the container B. kinetic energy of the gas C. number of collisions between the gas molecules D. number of repulsion between the gas molecules	A
19.	When concentrated H₂ SO ₄ is added to NaCI _(s), the gas evolved A. bleaches damp blue litmus paper B. forms a white preciptate with AgNO_3(aq) C. forms a white precipitate with BaCI_2(aq) D. turns moist red litmus paper blue	A
20.	The collision theory proposes that A. reactants collide more frequently to bring about reduction in the reaction rate B. all collisions of reactants are effective C. reactants must collide with a certain minimum amount of energy to from products D. the fewer the collisions the faster the reaction rate	C

11.	The force of attraction between covalent molecules is? A. electrostatic attraction B. hydrogen bonding C. ionic force D. van der Waals forces Show Content Detailed Solution Covalent bond involves the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons.	A
12.	What is the mass of 6.02 x 10²⁴ atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10²³ atoms mol^-1] A. 240g B. 24 g C. 2.4g D. 0.24g	A
13.	Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14] A. NH₃ = 17 B. NH₄CI = 53.5 C. NH₄NO₃ = 80 D. (NH₃)₂SO₄ = 132	A
14.	Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14] A. NH₃ = 17 B. NH₄CI = 53.5 C. NH₄NO₃ = 80 D. (NH₃)₂SO₄ = 132	A
15.	If 5.00cm³ of 0.20 mol dm^-3Na₂CO₃ was diluted with distilled water to obtain 250 cm³ solution, what is the concentration of the resulting solution? A. 0.004 mol dm^-3 B. 0.02 mol dm^-3 C. 0.20mol dm^-3 D. 0.40mol dm^-3	A

16.	Consider the reaction represented by the following equation: Zn_(s) + 2HCI_(aq) → ZnCI_2(aq) + H_2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm^-3] A. 1.12 dm³ B. 2.24dm³ C. 4.48dm³ D. 8.96dm³	A
17.	Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35] A. Chlorine B. Hydrogen C. Neon D. Oxygen	A
18.	In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the A. number of the collisions between the gas molecules and the walls of the container B. kinetic energy of the gas C. number of collisions between the gas molecules D. number of repulsion between the gas molecules	A
19.	When concentrated H₂ SO ₄ is added to NaCI _(s), the gas evolved A. bleaches damp blue litmus paper B. forms a white preciptate with AgNO_3(aq) C. forms a white precipitate with BaCI_2(aq) D. turns moist red litmus paper blue	A
20.	The collision theory proposes that A. reactants collide more frequently to bring about reduction in the reaction rate B. all collisions of reactants are effective C. reactants must collide with a certain minimum amount of energy to from products D. the fewer the collisions the faster the reaction rate	C