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Chemistry
WAEC / WASSCE 1988
Atomic Structure and Periodic Table
The following are uses of radioactive isotopes except for
A
sterilization of medical equipment
B
tracing reaction paths
C
dating elements
D
radiography
E
determining equilibrum positions
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 1988
Atomic Structure and Periodic Table
During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm3 at s.t.p)
A
0.224 dm3
B
0.280 dm3
C
0.560 dm3
D
2.24 dm3
E
22.4 dm3
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Atomic Structure and Periodic Table
Solution
The periodic classification of elements is an arrangement of the elements in order of their
A
Atomic Weights
B
Isotopic Weights
C
Molecular Weights
D
Atomic Numbers
E
Atomic Masses
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Atomic Structure and Periodic Table
Solution
Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,
A
P will form an electrovalent bond with R
B
Q will form a covalent bond with S
C
R will form an electrovalent bond with S
D
Q will form an electrovalent bond with S
E
Q will form a covalent bond with R
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Atomic Structure and Periodic Table
Solution
When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are?
A
nitrogen and carbondioxide
B
the rare gases
C
nitrogen and oxygen
D
nitrogen and the rare gases
E
nitrogen, carbondioxide and the rare gases
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Atomic Structure and Periodic Table
Solution
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
A
ionic bond
B
electrovalent bond
C
covalent bond
D
co-ordinate bond
E
hydrogen bond
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Atomic Structure and Periodic Table
Solution
The nucleus of an atom contains
A
protons only
B
neurons only
C
protons and electrons
D
neutrons and electrons
E
protons and neutrons
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1978
Atomic Structure and Periodic Table
Solution
Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. Which behaves as an oxidizing agent?
A
Fe2+
B
Cl2
C
Fe3+
D
Cl-
E
H2O
medium Difficulty
Study Explanation