by Sunday | Dec 27 | Chemistry WAEC
1s22s22p63s23p63d104s24p4 A. period 4, p- block B. period 3, p- block C. period 4, d- block D. period 3, d- block Correct Answer: Option A – period 4, p- block Explanation Selenium is a chemical element with the symbol Se and atomic number 34. It is a...
by Sunday | Dec 27 | Chemistry WAEC
I. is a white powder II. reacts with HCl. III. reacts with NaOH IV. is insoluble in water A. alkaline B. amphoteric C. acidic D. neutral Correct Answer: Option B – amphoteric Explanation An amphoteric oxide is an oxide that can act as either an acid or base in a...
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...
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
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