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.
Which of the following statement is correct about the periodic table?
Elements in the same period have the same number of valency electron
The valence electron of the elements in the same period increase progressively across the period
Elements in the same group have the same number of electron shells
The non-metallic properties of the elements tend to decrease across each period
Correct answer is B
The valence electron of the elements in the same period increase progressively across the period due to an increase in atomic number
The fundamental difference between the three states of matter is the
shape of their particles
number of particles in each state
shape of the container they occupy
degree of movement of their particles
Correct answer is D
the fundamental difference between the three states of matter is their degree of movement, gaseous particles are very loosely packed hence they can move about easily. The particles of solids are closely packed so solids only make vibrational movement, while liquid particles can move past each other because their particles are not as closely packed as those of solids.
0.203
0.579
2.030
5.790
Correct answer is B
Mole fraction = \(\frac{\text{Partial pressure of component}}{\text{Total pressure of compound}}\)
= \(\frac{452}{780}\)
= 0.579
120 cm3
200 cm3
450 cm3
750 cm3
Correct answer is B
From P1V1 = P2V2
1 * V1 = 1.5 * V2
((1 * 300)/1.5) = V2
∴ V2 = 200 cm3
14
12
11
10
Correct answer is A
K\(_{2}\)Cr\(_{2}\)O\(_{7}\) + HCl → Cl\(_{2}\) + KCl + CrCl\(_{3}\) + H\(_{2}\)O
Balancing the equation, we have
K\(_{2}\)Cr\(_{2}\)O\(_{7}\) + 14HCl → 3Cl\(_{2}\) + 2KCl + 2CrCl\(_{3}\) + 7H\(_{2}\)O