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.
Elements in the same group of the periodic table have
the same number of valence electrons
the same number of electron shells
different chemical behaviour
the same atomic size
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements is not true of halogens?
they exist in different physical states
they exist as diatomic molecules
their ionic radii decrease down the group
their melting and bolling points increase down the group
Correct answer is C
No explanation has been provided for this answer.
86 and 230
87 and 234
88 and 233
90 and 238
Correct answer is A
\(^{234} _{88} Q \to R + ^4 _2 He\)
\(\therefore R = ^{234 - 4} _{88 - 2} R\)
= \(^{230} _{86} R\)
What is the atomic number of an element whose cation Y+ has the electronic configuration 1s22s22p6?
9
10
11
12
Correct answer is C
No explanation has been provided for this answer.
The valence electrons in a chloride ion are [17CI]
2p electrons only
3s and 3p electrons only
3p and 3d electrons only
3p electrons only
Correct answer is B
No explanation has been provided for this answer.
Find the number of neutrons in an atom represented by 4521X.
21
24
45
66
Correct answer is B
No explanation has been provided for this answer.
The mass spectrometer can be used to measure mass of
an atom
an electron
a proton
a neutron
Correct answer is A
No explanation has been provided for this answer.
Which of the these metals will not liberate hydrogen from dilute HCI?
Copper
Iron
Magnesium
Zinc
Correct answer is A
No explanation has been provided for this answer.
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
2.24 dm3
5.60dm3
11.20dm3
44.80dm3
Correct answer is B
No explanation has been provided for this answer.
Pig-iron is brittle because it contains
a high percentage of carbon as impurity
calcium trioxosilicate (IV)
unreacted haematite
undecomposed limestone
Correct answer is A
No explanation has been provided for this answer.
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