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.
not proceed spontaneously at the given
proceed spontaneously at the given temperature
proceed in the reverse direction at the given temperature
proceed spontenously at lower temperature
Correct answer is B
Where ∆G = ∆H - T∆S
Given data; ∆G = ?
∆H = -72KJ/mol,
T→ (25+273)K = 298K
∆S = -106J/mol or -0.106KJ/mol/K
: ∆G = -72 -(298 * -0.106)
= -72 + 31.588
∆G = -40.412KJ/mol
One of the condition for spontaneity of a reaction as ∆G to be negative.
Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it
is strongly oxidizing
is volatile
renders the metal passive
forms a layer of oxide on the metal
Correct answer is A
No explanation has been provided for this answer.
The ion that can be used as an oxidizing agent is
Au3+
Fe3+
ClO-
Ca2+
Correct answer is C
No explanation has been provided for this answer.
264 g
39 g
352 g
156 g
Correct answer is A
No explanation has been provided for this answer.
If 30cm3 of gas at 50oC is warmed to 80o at a fixed pressure, the fractional increase in volume is
0.009
0.093
0.910
1.090
Correct answer is D
No explanation has been provided for this answer.