by Sunday | Mar 17 | Chemistry WAEC
A. H2 B. NH3 C. O2 D. H2S Correct Answer: Option D = H2S Explanation Kipp’s apparatus is a laboratory apparatus specially designed for producing a small amounts of gases and is used to produce usually hydrogen...
by Sunday | Mar 17 | Chemistry WAEC
A. electrons B. core electrons C. valence shells D. valence electrons Correct Answer: Option D – valence electrons Explanation This periodic table shows the valences of element groups.
by Sunday | Mar 17 | Chemistry WAEC
A. Chromatography B. Crystallization C. Distillation D. Electrolysis Correct Answer: Option D = Electrolysis Explanation Uses of electrolysis: Electrolysis is used in the extraction of metals from their ores. It is used for refining certain metals such as copper and...
by Sunday | Mar 17 | Chemistry WAEC
I. boiling point II. density III. smell IV. solubility in water A. i and ii only B. ii and iv only C. iii and iv D. i, ii, iii and iv Correct Answer: Option B – ii and iv only Explanation The method of collecting a gas produced by a chemical reaction will depend...
by Sunday | Mar 17 | Chemistry WAEC
A. 2 B. 3 C. 4 D. 5 Correct Answer: Option D = 5 Explanation Its electronic configuration in ground state is 1s2 2s2 2p6 3s2 3p6 4s1 3d5.
by Sunday | Mar 17 | Chemistry WAEC
A. electrons are negatively charged B. electrons have a negligible mass C. nuclei of atoms are positively charged D. protons are positively charged Correct Answer: Option C – nuclei of atoms are positively charged Explanation The model of an atom put forward by...
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
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