by Sunday | Sep 13 | Chemistry JAMB
A. ΔH is negative and greater than TΔS B. ΔH is negative and ΔS = 0 C. ΔH is positive and less than TΔS D. ΔH is positive and equal to TΔS Correct Answer: Option A = ΔH is negative and greater than TΔS
by Sunday | Sep 13 | Chemistry JAMB
A. 10g B. 25g C. 20g D. 15g Correct Answer: Option A – 10g Explanation Equation: Ca(HCO3)2 → CaCO3 (precipitate) + H2O + CO2 (in the presence of heat) V = 200 cm³ = 0.2 dm³ C = 0.5 mol/dm³ = 0.5M N = CV ⟹ N = 0.5 × 0.2 = 0.1 mole From the equation 1 mole of...
by Sunday | Sep 13 | Chemistry JAMB
A. addition of water, filtration, evaporation to dryness and sublimation B. filtration, evaporation to dryness, addition of water and sublimation C. sublimation, filtration, evaporation and addition of water D. sublimation, addition of water, filtration and...
by Sunday | Sep 13 | Chemistry JAMB
A. Ca(OH)2 and NaOH B. Na2CO3 C. NaCl D. NaOH Correct Answer: Option A – Ca(OH)2 and NaOH Explanation Soda-lime is a mixture of caustic soda (NaOH) and lime water (Ca(OH)2).
by Sunday | Sep 13 | Chemistry JAMB
A. van der waals force B. dative bond C. ionic bond D. a covalent bond Correct Answer: Option D – a covalent bond Explanation Hydrogen bond is a covalent intermolecular bond that exists between hydrogen and highly electronegative elements like nitrogen, oxygen,...
by Sunday | Sep 13 | Chemistry JAMB
A. -3, +3 B. +5 C. -3, +5 D. -3 Correct Answer: Option A = -3, +3 Explanation Ammonium nitrite = NH4NO2 NH4+ : Let the oxidation number of Nitrogen = x x + 4 = 1; ⟹ x = 1 – 4 x = -3 NO2− : x – 4 = -1; x = -1 + 4 ⟹ x = +3. The oxidation numbers for Nitrogen...
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
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