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.
The number of unpaired electrons in an atom of an element 8Q is _______?
2
4
6
8
Correct answer is A
No explanation has been provided for this answer.
The alkaline earth metals have similar chemical properties because________?
They are in the same period
Their salts are colourless
They have the same number of valence electrons
They are very reactive
Correct answer is C
No explanation has been provided for this answer.
Which of the following halogens is solid at room temperature?
Bromine
Chlorine
Flourine
Iodine
Correct answer is D
No explanation has been provided for this answer.
The gas given off when ethanol reacts with sodium is
Carbon(IV)oxide
Hydrogen
Methane
Oxygen
Correct answer is B
No explanation has been provided for this answer.
The following transition metal ions would be coloured in aqueous solution except________?
Cr3+
Fe3+
Mn3+
Sc3+
Correct answer is D
No explanation has been provided for this answer.
Which of the following pairs of compounds belongs to the same homologous series?
C3H8 and C3H6
C4H10 and C5H10
C2H4 and C4H10
C2H6 and C4H10
Correct answer is D
both ethane and butane are in the same homologous series.( alkanes)
Which of the following pairs of elements forms amphoteric oxides?
Be and Mg
Na and K
B and Al
Si and Pb
Correct answer is D
Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides.
Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides.
20
18
16
2
Correct answer is A
No explanation has been provided for this answer.
The shape of a molecule of water is _______?
Non-linear
Octahedral
Pyramidal
Tetrahedral
Correct answer is A
No explanation has been provided for this answer.
The compound formed between 14X and 16Y is _______?
XY
XY2
X2Y
X4Y6
Correct answer is B
No explanation has been provided for this answer.
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