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.
sulphur (VI) oxide
hydrogen chloride
sulphur (VI) oxide
hydrogen sulphide
Correct answer is D
No explanation has been provided for this answer.
The highest rate of production of carbon (lV) oxide can be achieved using
0.05 mol -3HCI and 5g powdered CaCO3
0.05 mol -3HCI and 5g lump CaCO3
0.10 mol -3HCI and 5g powdered CaCO3
0.025 mol -3HCI and 5g powdered CaCO3
Correct answer is C
No explanation has been provided for this answer.
An increase in entropy can best be illustrated by
mixing of gases
freezing of water
the condensation of vapour
solidifying candle wax
Correct answer is A
No explanation has been provided for this answer.
+ 262 KJ mol -1
- 262 KJ mol -1
+ 42 KJ mol -1
- 42 KJ mol -1
Correct answer is D
\(\Delta H (formation) (CO_2) = -394\)
\(\Delta H (formation) (H_2 O) = -242\)
\(\Delta H (formation) (CO) = -110\)
\(X = \sum H_{P} ^{F} - \sum H_{R} ^{F}\)
= (-394+ 0) - (-110 - 242 )
= -394 +352
= - 42 kJmol\(^{-1}\)
A metal M displaces zinc from ZnCl solution
This shows that
electrons flow from zinc to M
M is more electropositive than zinc
M is more electonegative than zinc
zinc is more electropositive than M
Correct answer is B
No explanation has been provided for this answer.