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.
tribasic
unionizeable
monobasic
dibasic
Correct answer is C
No explanation has been provided for this answer.
What current in amperes will deposit 2.7g of aluminium in 2 hours?
[Al = 27, F = 96 500 C mol-1]
32
8
4
16
Correct answer is C
Al3+ + 3e → Al
3 * 96500 → 27
I = 3600 * 2 → 27
I = (2.7/27) * ((3 * 96500)/(3600 * 2))
= 4.025 ≈ 4
The bonds in the reacting molecules are more readily broken
The molecular collisions become more violent
A lower proportion of the molecules has the necessary minimum energy to react
The collision frequency of the molecules increase
Correct answer is D
No explanation has been provided for this answer.
A metal M displaces zinc from zinc chloride solution. This shows that
M is more electronegative than zinc
Zinc is above hydrogen in the series
M is more electropositive than zinc
Electrons flow from zinc to M
Correct answer is C
No explanation has been provided for this answer.
P(g) + Q(g) ↔ 3R(s) + S(g) ΔH is negative
Which of the following will increase the yield of R?
Using a larger close vessel
Increasing the temperature
Removing some S
Adding a positive catalyst
Correct answer is C
No explanation has been provided for this answer.