by Sunday | Mar 18 | Chemistry WAEC
A. Copper B. Potassium C. Sodium D. Zinc Correct Answer: Option A – Copper Explanation Most alkali metals and alkaline earth metals react with water to produce hydrogen. The alkali metals comprise Group 1 of the periodic table, and include lithium, sodium,...
by Sunday | Mar 18 | Chemistry WAEC
A. Aufbau Principle B. Hund’s rule C. Pauli Exclusion Principle D. Periodic law Correct Answer: Option A – Aufbau Principle Explanation – The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy...
by Sunday | Mar 18 | Chemistry WAEC
A. 0.010 mol/dm3 B. 0.020 mol/dm3 C. 0.100 mol/dm3 D. 0.150 mol/dm3 Correct Answer: Option B = 0.020 mol/dm3 Explanation CaVa/CbVb = Na/Nb (0.01 X 20) / (Cb X 20) = 1/2 cross multiply → Cb = (0.01 X 20 X 2)/(20 X 1) Cb = 0.02...
by Sunday | Mar 18 | Chemistry WAEC
A. 5.4x 10 B. 5.4 x 10−3 B. 5.4x 10−1 C. 5.4 x 10−2 Correct Answer: Option B = 5.4 x 10−3 Explanation No. of moles = (molar conc X volume)/1000 No. of moles = 0.108 X 50 /1000 : No. of moles = 0.0054...
by Sunday | Mar 18 | Chemistry WAEC
A. A salt whose solubility increases with temperature would not crystallize easily on cooling B. A salt whose solubility is independent of temperature would normally crystallize out on cooling C. Crystallization would be efficient in separating out a salt whose...
by Sunday | Mar 18 | Chemistry WAEC
A. NH4OH B. Ca(OH)2 C. NaOH D. KOH Correct Answer: Option B = Ca(OH)2 Explanation -The hydroxides of sodium, potassium, and ammonium are very soluble in water. The hydroxides of calcium and barium are moderately...
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