Chemistry, 1992, WASSCE/WAEC MAY/JUNE, Exam, Paper 1 | Objectives

Paper Info

Year :

1992

Title :

Chemistry

Exam :

WASSCE/WAEC MAY/JUNE

Paper 1 | Objectives

1 - 10 of 37 Questions

#	Question	Ans
1.	When steam is passed over white-hot coke, the products are A. carbon (IV) oxide and nitrogen B. carbon (II) oxide and hydrogen C. carbon (ll) oxide and nitrogen D. carbon (lV) oxide and steam Show Content Detailed Solution Reaction: C (white hot coke) + H\(_2\)O (steam) → CO + H\(_2\).	B
2.	The maximum number of electrons that can accommodated in the shell having the principal quantum number 3 is A. 3 B. 9 C. 10 D. 18 E. 32	D
3.	Methanol is obtained from wood by A. esterification B. bacterial decomposition C. combustion D. fractional distillation E. destructive distillation	E
4.	Study carefully the reaction represented by the equation below. 2H₂O ₂_(l) → O ₂_(g) + 2H₂O_(l). Which of the following will not reaction increase the reaction rate? A. Heating the hydrogen peroxide B. Adding a pinch of MnO₂ to the reactant C. increasing the concentration of the H₂O₂ D. Adding water to the reactant E. Exposing the reactant to sunlight	D
5.	Which of the following processes is a physical reaction? A. Electrolysis B. Hydrolysis C. Allotropic change D. Neutralization E. Corrosion	C
6.	If the volume of a given mass of gas at 298 K and pressure of 205.2 x 10\(^3\) Nm\(^{-2}\) is 2.12dm\(^3\), what is volume of the gas at s.t.p? (Standard pressure = 101.3 x 10\(^3\) Nm\(^{-2}\), Standard temperature = 273K) A. 39.3dm ³ B. 22.4dm³ C. 4.93dm³ D. 3.93dm³ E. 0.393dm³ Show Content Detailed Solution V\(_1\) = 2.12dm\(^3\), V\(_2\) = ? P\(_1\) = 205.2 x 10\(^3\) Nm\(^{-2}\), P\(_2\) = 101.3 x 10\(^3\) Nm\(^{-2}\) T\(_1\) = 293K, T\(_2\) = 273K Using \(\frac{P_1 * V_1}{T_1}\) = \(\frac{P_2 * V_2}{T_2}\) : V\(_2\) = \(\frac{P_1 * V_1 * T_2}{P_2 * T_1}\) → \(\frac{205.2 x 10^3 * 2.12 * 273}{101.3 x 10^3 * 293}\) = 4.0dm\(^3\)	D
7.	The following acids are monobasic except A. methanoic acid B. dioxonitrate lll acid C. ethanedioic acid D. oxochlorate (l) acid E. hydrobromic acid	C
8.	The reactions ethyne are mainly A. substitution reactions B. addition reactions C. addition polymerization D. catalytic hydrogenation E. catalytic halogenation	B
9.	When air is passed through potash and then pyrogallol, the components are noble gases, A. oxygen and carbon (IV) oxide B. oxygen and nitrogen C. nitrogen and water vapour D. water vapour and carbon (IV) oxide E. oxygen and water vapour	C
10.	The halide used widely in photography is A. ammonium chloride B. calcum chloride C. silver bromide D. sodium brmide E. aluminium fluroide	C

1.	When steam is passed over white-hot coke, the products are A. carbon (IV) oxide and nitrogen B. carbon (II) oxide and hydrogen C. carbon (ll) oxide and nitrogen D. carbon (lV) oxide and steam Show Content Detailed Solution Reaction: C (white hot coke) + H\(_2\)O (steam) → CO + H\(_2\).	B
2.	The maximum number of electrons that can accommodated in the shell having the principal quantum number 3 is A. 3 B. 9 C. 10 D. 18 E. 32	D
3.	Methanol is obtained from wood by A. esterification B. bacterial decomposition C. combustion D. fractional distillation E. destructive distillation	E
4.	Study carefully the reaction represented by the equation below. 2H₂O ₂_(l) → O ₂_(g) + 2H₂O_(l). Which of the following will not reaction increase the reaction rate? A. Heating the hydrogen peroxide B. Adding a pinch of MnO₂ to the reactant C. increasing the concentration of the H₂O₂ D. Adding water to the reactant E. Exposing the reactant to sunlight	D
5.	Which of the following processes is a physical reaction? A. Electrolysis B. Hydrolysis C. Allotropic change D. Neutralization E. Corrosion	C

6.	If the volume of a given mass of gas at 298 K and pressure of 205.2 x 10\(^3\) Nm\(^{-2}\) is 2.12dm\(^3\), what is volume of the gas at s.t.p? (Standard pressure = 101.3 x 10\(^3\) Nm\(^{-2}\), Standard temperature = 273K) A. 39.3dm ³ B. 22.4dm³ C. 4.93dm³ D. 3.93dm³ E. 0.393dm³ Show Content Detailed Solution V\(_1\) = 2.12dm\(^3\), V\(_2\) = ? P\(_1\) = 205.2 x 10\(^3\) Nm\(^{-2}\), P\(_2\) = 101.3 x 10\(^3\) Nm\(^{-2}\) T\(_1\) = 293K, T\(_2\) = 273K Using \(\frac{P_1 * V_1}{T_1}\) = \(\frac{P_2 * V_2}{T_2}\) : V\(_2\) = \(\frac{P_1 * V_1 * T_2}{P_2 * T_1}\) → \(\frac{205.2 x 10^3 * 2.12 * 273}{101.3 x 10^3 * 293}\) = 4.0dm\(^3\)	D
7.	The following acids are monobasic except A. methanoic acid B. dioxonitrate lll acid C. ethanedioic acid D. oxochlorate (l) acid E. hydrobromic acid	C
8.	The reactions ethyne are mainly A. substitution reactions B. addition reactions C. addition polymerization D. catalytic hydrogenation E. catalytic halogenation	B
9.	When air is passed through potash and then pyrogallol, the components are noble gases, A. oxygen and carbon (IV) oxide B. oxygen and nitrogen C. nitrogen and water vapour D. water vapour and carbon (IV) oxide E. oxygen and water vapour	C
10.	The halide used widely in photography is A. ammonium chloride B. calcum chloride C. silver bromide D. sodium brmide E. aluminium fluroide	C