by Sunday | Dec 27 | Chemistry WAEC
A. 1s22s22px22py0 A. 1s22s22px12py1 C. 1s22s12px12py12pz1 D. 1s12s22px12py1 Correct Answer: Option C – 1s22s12px12py12pz1 Explanation – So any electron configuration in which the last electron (again, the valence electron) is in a higher energy orbital,...
by Sunday | Dec 27 | Chemistry WAEC
I. reacts with oxygen to form an acidic oxide II. forms ionic chlorides III. has variable oxidation states IV. displaces hydrogen from dilute HCl A. I and III only B. I and II only C. II and IV only D. I, II, III and IV Correct Answer: Option C – II and IV only...
by Sunday | Dec 27 | Chemistry WAEC
A. atomic number increases B. effective nuclear charge increases C. mass number decreases D. screening effect decreases Correct Answer: Option B – effective nuclear charge increases Explanation As the nuclear charge increases, its attraction for the outermost...
by Sunday | Dec 27 | Chemistry WAEC
A. 2 – methyl but – 1 – ene B. 2 – methyl but – 2 – ene C. 3 – methyl but – 1 – ene D. 3 – methyl but – 2 – ene Correct Answer: Option C = 3 – methyl but – 1 – ene Explanation...
by Sunday | Dec 27 | Chemistry WAEC
A. 1 B. 2 C. 3 D. 4 Correct Answer: Option D = 4 Explanation Nitrogen has three unpaired electrons and one lone pair of electrons; therefore, it can form three covalent bonds and one coordinate bond. E.g ammonium...
by Sunday | Dec 27 | Chemistry WAEC
A. Covalent bond B. Hydrogen bond C. Ionic bond D. Metallic bond Correct Answer: Option B – Hydrogen bond Explanation Hydrogen bond is an intermolecular force which arises when hydrogen is covalently linked to elements like nitrogen, oxygen and...
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