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.
When dissolved in water, NaOH flakes show
An endothermic change
An exothermic change
A slow reaction
A rapid reaction
Correct answer is B
No explanation has been provided for this answer.
The Arrhenius equation expresses the relationship between the speed of a reaction and its
Molecular collision
Heat of reaction
Catalyst
Activation energy
Correct answer is D
No explanation has been provided for this answer.
When H2S is passed into a solution of iron (III) chloride, the solution turns
Pale green
Pale red
Brown
Colourless
Correct answer is A
A reaction between Iron (iii) chloride and Hydrogen sulphide leads to the reaction
2FeCl3(aq) + H2S(g) → 2FeCl2(aq) + 2HCl(aq) + S(s)
The colour change is from REDDISH BROWN to PALE GREEN.
PCl5(g) ↔ PCl3(g) + Cl2(g)
In the reaction above, a decrease in pressure will
Decelerate the reaction
Increase the yield of PCl3
Increase the yield of PCl5
Accelerate the reaction
Correct answer is B
No explanation has been provided for this answer.
Which of the following equations show that a reaction is in equilibrium?
ΔG < O
ΔG = ΔH – TΔS
ΔG > O
ΔG = O
Correct answer is D
No explanation has been provided for this answer.