Chemistry 2003 WAEC Past Questions

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The electronic configuration of an element is 1\(s^2\) 2\(s^2\) 2\(p^6\) 3\(s^2\) 3\(p^3\). Where is the element located in the periodic table?

A. Group lll, period 3
B. Group lll, period 5
C. Group V, period 3
D. Group V, period 5

View Answer & Discuss (7) WAEC 2003

Group O of elements are unreactive because

A. their outmost shells contain equal number of electrons
B. their highest occupied enegy level is full
C. they are monatomic gases
D. they are non-metals

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An element X with electronic configuration \(1S^22S^22P^63S^2\) combines with another element Y with the configuration \(1S^2S^22P^23S^23P^5\). What is the formula of the compound formed?

A. X₂Y₅
B. X₂Y₃
C. XY₃
D. XY₂

View Answer & Discuss (9) WAEC 2003

Which of the following statements about dative bonding is not correct?

A. there is sharing of electrons
B. one atom must possess a lone pair electrons
C. each participating atom contributes one electron
D. it can be formed between molecules

View Answer & Discuss (2) WAEC 2003

Which of the following quantities is the same for one mole of Br_2(l) and one mole of He_(g)?

A. Number of molecules
B. Number of atoms
C. Total mass of the particles
D. Volume occupied at s.t.p

View Answer & Discuss (8) WAEC 2003

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