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 quantities is the same for one mole of Br2(l) and one mole of He(g)?
Number of molecules
Number of atoms
Total mass of the particles
Volume occupied at s.t.p
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements about dative bonding is not correct?
there is sharing of electrons
one atom must possess a lone pair electrons
each participating atom contributes one electron
it can be formed between molecules
Correct answer is C
No explanation has been provided for this answer.
X2Y5
X2Y3
XY3
XY2
Correct answer is D
Element X has a valency of 2 while Y has a valency of 1,
so they exchange valency to form \( XY_2\)
Group O of elements are unreactive because
their outmost shells contain equal number of electrons
their highest occupied enegy level is full
they are monatomic gases
they are non-metals
Correct answer is B
No explanation has been provided for this answer.
Group lll, period 3
Group lll, period 5
Group V, period 3
Group V, period 5
Correct answer is C
the element belongs to group 5, since we have two coefficients that are the same we simply add the powers that give 5. while the highest coefficient gives the period that is 3.
therefore, the element is found in group 5 period 3.