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 elements would produce coloured ion in agueous solution?
Calcuim
Copper
Magnesuim
Sodium
Correct answer is B
No explanation has been provided for this answer.
The shape of the water molecule is_______?
Linear
Pyramidal
Tetrahedral
V-shaped
Correct answer is D
The bond angle in water is compressed approximately to 105°, such that the structure of the water molecule is V-shaped or Angular.
Which of the following arrangements shows increasing order of reactivity of the halogens?
F2 > Cl2 > Br2 >I2
I2 < Br2 < Cl2
F2 < Cl2 < Br2
I2 > Br2 > Cl2 > F2
Correct answer is B
The reactivity of halogens decreases as you move down Group 7.
Halogens become less reactive as you move down the group as the atomic radius of the element increases which means that the distance between the outer shell of electrons and the nucleus increases.
An unsaturated solution differs from a saturated solution at a given temperature because it
Cannot dissolve more solute
Can hold more solute than it can actually dissolve
Can still dissolve more solute at given temperature
Form crystal more easily on cooling
Correct answer is C
An unsaturated solution contains a lesser amount of solute than that in a saturated solution. It can go on to dissolve more quantities of solute at the same temperature until it becomes a saturated solution.
Aluminium is used in the manufacture or aircraft because it
Is hard and brittle
Is light and resists corrosion
Has high density and conducts electricity
Is malleable and ductile
Correct answer is B
No explanation has been provided for this answer.
Metals can be stretched into wires because they are
Ductile
Good conductors
Lustrous
Malleable
Correct answer is A
No explanation has been provided for this answer.
The mass of potassium hydroxide required to make 300.ocm3 of 0.4 moldm-3 solution is {KOH = 56.0}
26.88g
13.44g
6.72g
3.36g
Correct answer is C
300cm3 of 0.4moldm3
1000cm3 contains 0.4mole
300cm3 will contain \(\frac{300 \times 0.4}{1000}\)
= 0.12mole
Number of moles = \(\frac{Mass}{\text {Molecular mass}}\)
Mass = number of moles x m.mass
= 0.12 x 56 = 6.72g
Chemicals that are produced in small quantities and with very degree of purity are
Bulk chemicals
Fine chemicals
Heavy chemicals
Light chemicals
Correct answer is B
No explanation has been provided for this answer.
The boiling points of HF, H2O and NH3 increase in the order of
NH3
H2O < HF
HF < NH3 < H2O
NH3 < HF < H2O
Correct answer is D
Ammonia = -33.34°C; Hydrogen fluoride = 19.5°C; Water = 100°C
When element \(_{20}\)Y combines with element \(_8\)Z, it forms
A covalent compound , YZ is formed
A covalent compound, ZY is formed
An ionic compound, YZ is formed
An ionic compound, ZY is formed
Correct answer is C
Y = 2,8,8,2 and Z = 2,6.
Y will readily give off its 2 valence electrons and Z will accept the 2 electrons in order to achieve octet configuration. Hence, the compound YZ is formed by ionic bonding.
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