Chemistry, 2014, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2014

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

31 - 40 of 45 Questions

#	Question	Ans
31.	A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is A. Zn²⁺ B. Pb²⁺ C. Ca²⁺ D. Al³⁺	C
32.	The general formula of haloalkanes where X represents the halide is A. C_n H _2n-1X. B. C _nH _2nX. C. C _nH _2n+2 X D. C _nH _2n+1X	D
33.	The alkanol obtained from the production of soap is A. propanol B. ethanol C. glycerol D. methanol	C
34.	Ethyne is passed through a hot tube containing organo-nickel catalyst to produce A. isoprene B. polythene C. ethanol D. benzene	D
35.	Due to the unstable nature of ethyne, it is stored by dissolving in A. ethane-1,2-diol B. propanol C. ethanoic acid D. propanone	D
36.	The process of converting starch to ethanol is A. cracking B. distillation C. fermentation D. oxidation	C
37.	The polymer used in making car rear lights is A. perspex B. bakeelite C. polystyrene D. polyacrylonitrile	A
38.	CH₃COOC₂H₅(1) + H₂O₍₁₎ ⇌ CH ₃COOH _(aq) + C ₂H ₅OH _(aq) The purpose of H⁺ in the reaction above is to A. increase the yield of products B. maintain the solution at a constant PH C. increase the rate of the hydrolysis D. decrease the rate of the reverse reaction	A
39.	A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula. [C = 12, H = 1] A. C₂H₆ B. C₃H₈ C. C₃H₄ D. C₆H₆ Show Content Detailed Solution molecular mass = 2 x vapour density = 2 x 39 = 79 ∴ Cn Hn = 78 12n + 1n = 78 13n = 78 n = \(\frac{78}{13}\) = 6 ∴ Cn Hn = C ₆H ₆	D
40.	Polystyrene is widely used as packaging materials for fragile objects during transportation because of its A. lightness B. low density C. high density D. high compressibility Show Content Detailed Solution EPS is known as one of the world’s most effective and lightweight insulation and packaging materials. It has low thermal conductivity and is moisture resistant, so it is often used as insulation against changing temperatures. Its high compressive strength gives it excellent shock absorption properties, making it an efficient packaging material.	D

31.	A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is A. Zn²⁺ B. Pb²⁺ C. Ca²⁺ D. Al³⁺	C
32.	The general formula of haloalkanes where X represents the halide is A. C_n H _2n-1X. B. C _nH _2nX. C. C _nH _2n+2 X D. C _nH _2n+1X	D
33.	The alkanol obtained from the production of soap is A. propanol B. ethanol C. glycerol D. methanol	C
34.	Ethyne is passed through a hot tube containing organo-nickel catalyst to produce A. isoprene B. polythene C. ethanol D. benzene	D
35.	Due to the unstable nature of ethyne, it is stored by dissolving in A. ethane-1,2-diol B. propanol C. ethanoic acid D. propanone	D

36.	The process of converting starch to ethanol is A. cracking B. distillation C. fermentation D. oxidation	C
37.	The polymer used in making car rear lights is A. perspex B. bakeelite C. polystyrene D. polyacrylonitrile	A
38.	CH₃COOC₂H₅(1) + H₂O₍₁₎ ⇌ CH ₃COOH _(aq) + C ₂H ₅OH _(aq) The purpose of H⁺ in the reaction above is to A. increase the yield of products B. maintain the solution at a constant PH C. increase the rate of the hydrolysis D. decrease the rate of the reverse reaction	A
39.	A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula. [C = 12, H = 1] A. C₂H₆ B. C₃H₈ C. C₃H₄ D. C₆H₆ Show Content Detailed Solution molecular mass = 2 x vapour density = 2 x 39 = 79 ∴ Cn Hn = 78 12n + 1n = 78 13n = 78 n = \(\frac{78}{13}\) = 6 ∴ Cn Hn = C ₆H ₆	D
40.	Polystyrene is widely used as packaging materials for fragile objects during transportation because of its A. lightness B. low density C. high density D. high compressibility Show Content Detailed Solution EPS is known as one of the world’s most effective and lightweight insulation and packaging materials. It has low thermal conductivity and is moisture resistant, so it is often used as insulation against changing temperatures. Its high compressive strength gives it excellent shock absorption properties, making it an efficient packaging material.	D