Chemistry, 2015, WASSCE/WAEC MAY/JUNE, Exam, Paper 1 | Objectives

Paper Info

Year :

2015

Title :

Chemistry

Exam :

WASSCE/WAEC MAY/JUNE

Paper 1 | Objectives

11 - 20 of 50 Questions

#	Question	Ans
11.	Which of the following halogens is solid at room temperature? A. Bromine B. Chlorine C. Flourine D. Iodine	D
12.	The alkaline earth metals have similar chemical properties because________? A. They are in the same period B. Their salts are colourless C. They have the same number of valence electrons D. They are very reactive	C
13.	The number of unpaired electrons in an atom of an element ₈Q is _______? A. 2 B. 4 C. 6 D. 8	A
14.	The bond formed when ammonia reacts with hydrogen ion to form ammonium ion is A. Covalent B. Dative C. Hydrogen bond D. Ionic	B
15.	To which group and period respectively does an element with 15 electrons belong? A. 3 and 3 B. 3 and 5 C. 5 and 3 D. 5 and 5 Show Content Detailed Solution (P) Arsenic is the element with 15 electrons which is found in Group 5 and Period 3	C
16.	The shape of a graphite crystal is A. Tetrahedral B. Pyramidal C. Octahedral D. Hexagonal	D
17.	Which of the following oxides is ionic? A. P₄O₁₀ B. MgO C. Al₂O₃ D. SO₂	B
18.	Which of the following substances when boiled with aqueous solution of sodium hydroxide would be hydrolyzed? i. Protein ii. Fat iii. Polythene A. i B. ii C. i and ii D. ii and iii	C
19.	Which of the following trioxonitrate(V) salts would decompose on heating to form a metal? A. Cu(NO₃)₂ B. AgNO₃ C. Pb(NO₃)₂ D. KNO₃	B
20.	Consider the following reaction equation: C2H4(g) + 3O2(g) \(\to\) 2CO2(g) + 2H2O(g) The volume of CO2(g) produced at s.t.p when 0.05 moles of C2H4(g) was burnt in O2(g) is [Molar Volume of gas = 22.4dm3 A. 1.12dm³ B. 2.24dm³ C. 3.72dm³ D. 4.48dm³ Show Content Detailed Solution \(\frac{\text{volume}}{\text{molar volume}}\) = 0.05 1 mole of ethane produces 2 moles of carbon(iv)oxide ∴ 0.05 mole of ethane will produce x moles of carbon(iv)oxide = \(\frac{\text{volume}}{22.4}\) = 0.05 X 2 X 22.4 = 2.24dm\(_3\)	B

11.	Which of the following halogens is solid at room temperature? A. Bromine B. Chlorine C. Flourine D. Iodine	D
12.	The alkaline earth metals have similar chemical properties because________? A. They are in the same period B. Their salts are colourless C. They have the same number of valence electrons D. They are very reactive	C
13.	The number of unpaired electrons in an atom of an element ₈Q is _______? A. 2 B. 4 C. 6 D. 8	A
14.	The bond formed when ammonia reacts with hydrogen ion to form ammonium ion is A. Covalent B. Dative C. Hydrogen bond D. Ionic	B
15.	To which group and period respectively does an element with 15 electrons belong? A. 3 and 3 B. 3 and 5 C. 5 and 3 D. 5 and 5 Show Content Detailed Solution (P) Arsenic is the element with 15 electrons which is found in Group 5 and Period 3	C

16.	The shape of a graphite crystal is A. Tetrahedral B. Pyramidal C. Octahedral D. Hexagonal	D
17.	Which of the following oxides is ionic? A. P₄O₁₀ B. MgO C. Al₂O₃ D. SO₂	B
18.	Which of the following substances when boiled with aqueous solution of sodium hydroxide would be hydrolyzed? i. Protein ii. Fat iii. Polythene A. i B. ii C. i and ii D. ii and iii	C
19.	Which of the following trioxonitrate(V) salts would decompose on heating to form a metal? A. Cu(NO₃)₂ B. AgNO₃ C. Pb(NO₃)₂ D. KNO₃	B
20.	Consider the following reaction equation: C2H4(g) + 3O2(g) \(\to\) 2CO2(g) + 2H2O(g) The volume of CO2(g) produced at s.t.p when 0.05 moles of C2H4(g) was burnt in O2(g) is [Molar Volume of gas = 22.4dm3 A. 1.12dm³ B. 2.24dm³ C. 3.72dm³ D. 4.48dm³ Show Content Detailed Solution \(\frac{\text{volume}}{\text{molar volume}}\) = 0.05 1 mole of ethane produces 2 moles of carbon(iv)oxide ∴ 0.05 mole of ethane will produce x moles of carbon(iv)oxide = \(\frac{\text{volume}}{22.4}\) = 0.05 X 2 X 22.4 = 2.24dm\(_3\)	B