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.
60
72
82
89
92
Correct answer is E
No explanation has been provided for this answer.
25.0 moles
12.5 moles
6.25 moles
3.125 moles
0.625 moles
Correct answer is C
Fe2O3 = 56 x 2 + 48 = 160 = 1 moles
1000gm will contain \(\frac{1000}{160}\) = 6.25 moles
Hydrogen diffuses through a porous plug
at the same rate as oxygen
at a slower rate than oxygen
twice as fast as oxygen
three times as fast as oxygen
four times as fast as oxygen
Correct answer is E
No explanation has been provided for this answer.
solid can be ground to a fine powder
density of the solid is 2.25gdm-3
solid begins to melt at 573k but is not completely melted until 648k
solid absorbs moisture from the atmosphere and turns into liquid
solid melts at 300k
Correct answer is C
No explanation has been provided for this answer.
0.5
2.0
3.0
4.0
5.0
Correct answer is D
No explanation has been provided for this answer.