Chemistry, 1994, WASSCE/WAEC MAY/JUNE, Exam, Paper 1 | Objectives

Paper Info

Year :

1994

Title :

Chemistry

Exam :

WASSCE/WAEC MAY/JUNE

Paper 1 | Objectives

11 - 20 of 36 Questions

#	Question	Ans
11.	The following will decolourize acidified potassium tetraoxomanganate (VII) solution except A. sulphur (lV) oxide B. but-3-ene C. pentane D. hydrogen sulphide E. propyne	C
12.	Polyatomicity is illustrated by molecules of A. sulphur B. carbon (IV) oxide C. noble gases D. liquefied oxygen E. liquefied nitrogen	A
13.	Calcium is usually extracted by the electrolysis of its A. trioxonitrate (V) B. tetraoxosulphate (IV) C. oxide D. hydride E. chloride	E
14.	When naphthalene on heating changes from the solid state directly to the gaseous state it undergoes A. evaporation B. sublimation C. decomposition D. combustion E. ionisation	B
15.	Which of the following occurs when an aqueous solution of sodium hydroxide is electrolysed using graphite electrodes? A. Sodium metal is produced at the anode B. Sodium amalgam is formed at the cathode C. Oxygen gas is produced at the anode D. The grahite anode dissolves E. The resulting solution becomes acidic	C
16.	If the volume of a given mass of gas at 0^oC is 27.3cm³, what will be the volume of the gas at 10^oC, pressure remaining constant? A. 2.73cm³ B. 28.3cm³ C. 37.3cm³ D. 273cm³ E. 283cm³	B
17.	Glucose can be obtained from starch by A. hydrogenation B. dissoiation C. hydrolysis D. dialysis E. dehydration	C
18.	How many faradays of electricity are required to liberate 9g aluminium? (AI = 27) A. 0.1 B. 0.3 C. 1.0 D. 2.7 E. 3.0	C
19.	When water is dropped on calcium carbide, the gaseous product is an A. alkane B. alkene C. alkyne D. alkanol E. alkanal	C
20.	Mg\(_2\) + 2HCI\(_{(aq)}\) → MgCI\(_{2(g)}\) + H\(_{2(g)}\).From the equation above what mass of hydrogen would be produced if 12.0 g of magnesium reacted completely with dilute hydrochloric acid? (H = 1, Mg = 24) A. 1.0g B. 2.0g C. 6.0g D. 12.0g E. 24.0g Show Content Detailed Solution Mg\(_2\) + 2HCI\(_{(aq)}\) → MgCI\(_{2(g)}\) + H\(_{2(g)}\). 24g Mg reacts with 2g H 1g Mg = \(\frac{2}{24}\)g H 12g Mg = \(\frac{2}{24} \times 12\)g H = 1g H.	A

11.	The following will decolourize acidified potassium tetraoxomanganate (VII) solution except A. sulphur (lV) oxide B. but-3-ene C. pentane D. hydrogen sulphide E. propyne	C
12.	Polyatomicity is illustrated by molecules of A. sulphur B. carbon (IV) oxide C. noble gases D. liquefied oxygen E. liquefied nitrogen	A
13.	Calcium is usually extracted by the electrolysis of its A. trioxonitrate (V) B. tetraoxosulphate (IV) C. oxide D. hydride E. chloride	E
14.	When naphthalene on heating changes from the solid state directly to the gaseous state it undergoes A. evaporation B. sublimation C. decomposition D. combustion E. ionisation	B
15.	Which of the following occurs when an aqueous solution of sodium hydroxide is electrolysed using graphite electrodes? A. Sodium metal is produced at the anode B. Sodium amalgam is formed at the cathode C. Oxygen gas is produced at the anode D. The grahite anode dissolves E. The resulting solution becomes acidic	C

16.	If the volume of a given mass of gas at 0^oC is 27.3cm³, what will be the volume of the gas at 10^oC, pressure remaining constant? A. 2.73cm³ B. 28.3cm³ C. 37.3cm³ D. 273cm³ E. 283cm³	B
17.	Glucose can be obtained from starch by A. hydrogenation B. dissoiation C. hydrolysis D. dialysis E. dehydration	C
18.	How many faradays of electricity are required to liberate 9g aluminium? (AI = 27) A. 0.1 B. 0.3 C. 1.0 D. 2.7 E. 3.0	C
19.	When water is dropped on calcium carbide, the gaseous product is an A. alkane B. alkene C. alkyne D. alkanol E. alkanal	C
20.	Mg\(_2\) + 2HCI\(_{(aq)}\) → MgCI\(_{2(g)}\) + H\(_{2(g)}\).From the equation above what mass of hydrogen would be produced if 12.0 g of magnesium reacted completely with dilute hydrochloric acid? (H = 1, Mg = 24) A. 1.0g B. 2.0g C. 6.0g D. 12.0g E. 24.0g Show Content Detailed Solution Mg\(_2\) + 2HCI\(_{(aq)}\) → MgCI\(_{2(g)}\) + H\(_{2(g)}\). 24g Mg reacts with 2g H 1g Mg = \(\frac{2}{24}\)g H 12g Mg = \(\frac{2}{24} \times 12\)g H = 1g H.	A