Chemistry, 2007, JAMB Exam, Exam, Paper 1 | Objectives

Paper Info

Year :

2007

Title :

Chemistry

Exam :

JAMB Exam

Paper 1 | Objectives

41 - 47 of 47 Questions

#	Question	Ans
41.	The IUPAC nomenclature of compound CH₃CH₂COOCH₂CH₃ is A. propyl ethanoate B. ethyl butanoate C. ethyl propanoate D. methyl butanoate	C
42.	When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of A. calcium tetraoxosulphate(VI) B. calcium trioxocarbonate (IV) C. calcium hydrogentrioxocarbonate (IV) D. aluminium trioxocarbonate (IV)	B
43.	A supersaturated solution is said to contain A. more solute than it can dissolve at that temperature in the presence of undissolved solute B. as much solute as it can dissolve at that temperature in the presence of undissolved solute C. as much solute as it can dissolve at that temperature D. more solute than it can dissolve at that temperature	D
44.	The presence of nitrogen in air is to slow down A. respiration and combustion B. combustion and corrosion C. corrosion and respiration D. respiration and transpiration	B
45.	A good drying agent should be A. deliquescent B. effervescent C. hygroscopic D. efflorescent	C
46.	Smog usually occurs over cities which A. burn a lot of fossil fuels B. have very few plants C. are surrounded by water D. are overpopulated	A
47.	What weight of NaCl is needed to make 2.0 dm³ of a 1.5M solution? [Na = 23, Cl = 35.5] A. 116 g B. 175 g C. 87 g D. 58 g Show Content Detailed Solution Molar mass of Nacl = 23 + 35.5 = 58.5 g/mol Number of moles of Nacl = conc. in mol/dm³ x vol. in dm³ = 1.5 * 2.0 = 3.0 moles 1 mole of NaCl has a weight of 58.5 * 3 = 175.5g	B

41.	The IUPAC nomenclature of compound CH₃CH₂COOCH₂CH₃ is A. propyl ethanoate B. ethyl butanoate C. ethyl propanoate D. methyl butanoate	C
42.	When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of A. calcium tetraoxosulphate(VI) B. calcium trioxocarbonate (IV) C. calcium hydrogentrioxocarbonate (IV) D. aluminium trioxocarbonate (IV)	B
43.	A supersaturated solution is said to contain A. more solute than it can dissolve at that temperature in the presence of undissolved solute B. as much solute as it can dissolve at that temperature in the presence of undissolved solute C. as much solute as it can dissolve at that temperature D. more solute than it can dissolve at that temperature	D
44.	The presence of nitrogen in air is to slow down A. respiration and combustion B. combustion and corrosion C. corrosion and respiration D. respiration and transpiration	B

45.	A good drying agent should be A. deliquescent B. effervescent C. hygroscopic D. efflorescent	C
46.	Smog usually occurs over cities which A. burn a lot of fossil fuels B. have very few plants C. are surrounded by water D. are overpopulated	A
47.	What weight of NaCl is needed to make 2.0 dm³ of a 1.5M solution? [Na = 23, Cl = 35.5] A. 116 g B. 175 g C. 87 g D. 58 g Show Content Detailed Solution Molar mass of Nacl = 23 + 35.5 = 58.5 g/mol Number of moles of Nacl = conc. in mol/dm³ x vol. in dm³ = 1.5 * 2.0 = 3.0 moles 1 mole of NaCl has a weight of 58.5 * 3 = 175.5g	B