Chemistry Practice Tests – Chemical Combination


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When element 20Y combines with element 8Z (WASSCE 2016)

 (a) a covalent compound, YZ is formed.
(b) a covalent compound, ZY is formed.
(c) an ionic compound, YZ is formed.
(d) an ionic compound, ZY is formed


The high boiling point of hydrogen fluoride can be explained in terms of _______

(a) Covalent bond      (b) Electrovalent bond      (c) Hydrogen bond      (d) Coordinate bond


The noble gases have been grouped in ________

(a) Group 4      (b) Group 3      (c) Group 1      (d) Group O


The metallic bond in potassium is weaker than that of sodium because potassium has a ________ (WASSCE)

(a) large atomic size
(b) small atomic size
(c) greater number of valence electrons
(d) higher melting point


Which of the following factors is very important in covalent bond formation? (WASSCE)

(a) Electronegativity      (b) Electropositivity      (c) Metallic character      (d) Presence of hydrogen


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