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.
5cm3
10cm3
20cm3
25cm3
50cm3
Correct answer is E
\(2NaOH + H_{2}SO_{4} = Na_{2}SO_{4} + 2H_{2}O\)
V x 0.5M = 2(10 x 1.25)
0.5V = 2 x 12.5
0.5V = 25
V = \(\frac{25}{0.5}\) = \(50cm^{3}\)
The periodic classification of elements is an arrangement of the elements in order of their
Atomic Weights
Isotopic Weights
Molecular Weights
Atomic Numbers
Atomic Masses
Correct answer is D
Henry Moseley arranged the elements in the periodic table by their atomic number and this gave rise to the statement of the modern periodic law
When sodium chloride and metallic sodium are each dissolved in water
both processes are exothermic
both processes are endothermic
the dissolution of metallic sodium is endothermic
the dissolution of metallic sodium is exothermic
the dissolution of sodium chloride is explosive
Correct answer is D
When small quantities of sodium metal is added to water, there is an exothermic reaction, and they react to form sodium hydroxide and hydrogen.
Basic Oxide
Acidic Oxide
Amphoteric Oxide
Neutral Oxide
Reactive Oxide
Correct answer is C
Zinc oxide is an amphoteric oxide.
- It will dissolve in both acids and alkalis
Which of the following statements is NOT correct?
The average kinetic energy of a gas is directly proportional to its temperature
At constant tempearture, the volume of a gas increases as the pressure increases
The pressure of a gas is inversely proportional to the density
The temperature of a gas is directly proportional to its volume
Correct answer is B
Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases.