2007 - JAMB Chemistry Past Questions and Answers - page 5
41
The IUPAC nomenclature of compound CH3CH2COOCH2CH3 is
A
propyl ethanoate
B
ethyl butanoate
C
ethyl propanoate
D
methyl butanoate
correct option: c
Users' Answers & Comments42
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)
correct option: b
Users' Answers & Comments43
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
correct option: d
Users' Answers & Comments44
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
correct option: b
Users' Answers & Comments45
A good drying agent should be
A
deliquescent
B
effervescent
C
hygroscopic
D
efflorescent
correct option: c
Users' Answers & Comments46
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
correct option: a
Users' Answers & Comments47
What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution?
[Na = 23, Cl = 35.5]
[Na = 23, Cl = 35.5]
A
116 g
B
175 g
C
87 g
D
58 g
correct option: b
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
Users' Answers & CommentsNumber 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