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.
39.3dm 3
22.4dm3
4.93dm3
3.93dm3
0.393dm3
Correct answer is D
V\(_1\) = 2.12dm\(^3\), V\(_2\) = ?
P\(_1\) = 205.2 x 10\(^3\) Nm\(^{-2}\), P\(_2\) = 101.3 x 10\(^3\) Nm\(^{-2}\)
T\(_1\) = 293K, T\(_2\) = 273K
Using \(\frac{P_1 * V_1}{T_1}\) = \(\frac{P_2 * V_2}{T_2}\)
: V\(_2\) = \(\frac{P_1 * V_1 * T_2}{P_2 * T_1}\)
→ \(\frac{205.2 x 10^3 * 2.12 * 273}{101.3 x 10^3 * 293}\)
= 4.0dm\(^3\)
Which of the following processes is a physical reaction?
Electrolysis
Hydrolysis
Allotropic change
Neutralization
Corrosion
Correct answer is C
No explanation has been provided for this answer.
Heating the hydrogen peroxide
Adding a pinch of MnO2 to the reactant
increasing the concentration of the H2O2
Adding water to the reactant
Exposing the reactant to sunlight
Correct answer is D
Reaction of decomposition of hydrogen peroxide is very slow in moderate temperatures without the presence of a catalyst.
It can be sped up by increasing the temperature, which triggers the reaction of thermal decomposition.
Methanol is obtained from wood by
esterification
bacterial decomposition
combustion
fractional distillation
destructive distillation
Correct answer is E
No explanation has been provided for this answer.
3
9
10
18
32
Correct answer is D
No explanation has been provided for this answer.