Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
5.0 moles dm3
3.0 moles dm3
2.5 moles dm3
1.0 molesv
0.5 moles dm3
Correct answer is C
Molar mass of KCIO\(_3\) = 122.5 g/mol
3.06g = 10
xg = 1000
\(frac{3.06 * 1000}{10}\)
= 306g
Molar conc = \(frac{Mass conc}{Molar mass}\)
Molar conc = \(frac{306}{122.5}\)
= 2.497mol/dm\(^3\)
10
7
5
2
1
Correct answer is D
No explanation has been provided for this answer.
Increasing the pressure of a gas
lowers the average kinetic energy of the molecules
decreases the density of the gas
decreases the temperature of the gas
increases the density of the gas
increases the volume of the gas
Correct answer is D
No explanation has been provided for this answer.
Fractional distillation without a dehydrant
simple distillation with a dehydrant
fractional distillation with a dehydrant
column chromatography
evaporation
Correct answer is C
Fractional distillation with a dehydrant is the most likely separation process to yield high-quality ethanol from palm wine. Adding a dehydrant helps to remove water from the ethanol more effectively during the distillation process, resulting in a higher purity of ethanol. This is important for producing high-quality ethanol suitable for various applications, including consumption or industrial use.
some CuO was reacted with excess dilute H2SO4
the solution was concentrated
when the concentrate was cooled, crystals formed were removed by filtration
the crystals were washed with very little cold water
the crystals were then allowed to dry
Correct answer is A
No explanation has been provided for this answer.