JAMB UTME - Chemistry - 2003
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Out of the given options, kerosene is the only nonpolar solvent, and therefore the only option that could potentially dissolve fat. Hydrochloric acid and calcium hydroxide are polar solvents, and water is a highly polar solvent, and would not be able to dissolve fat.
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CO(g) + H2O(g) ? CO2(g) + H2(g)
From the reaction above, calculate the standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in kJ mol-1 are -394, -242, and -110 respectively.
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-242 + 110 = -352 kJ mol-1
35 = -394 -(352)
= -394 + 352
= -42 kJ mol-1
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2HCI(ag) + CaCO3(s) ? CaCl2(s) + CO 2(g) +H2O(1)
From the reaction above, which of the curves in the diagram represents the production of carbon (IV) oxide as dilute HCI is added?
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What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?
[Al = 27, S = 32, H = 1, O = 16]
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I. \( \mathrm{H} = 1s^1 \) II. \( \mathrm{N} = 1s^2\,2s^2\,p^3 \) III. \( \mathrm{O} = 1s^2\,2s^2\,p^4 \) IV. \( \mathrm{Zn} = 1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,4s^2\,3d^{10} \)
From the above, which of the following pairs is like to be paramagnetic?
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When 10g of sodium hydroxide is dissolved in 1000cm3 of water, the sodium formed is approximately
[Na = 23, H = 1, O = 16]
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What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm3 solution?
[K2CrO4 = 194.2g mol-1]
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A compound contains 40.0% carbon 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.
[H = 1, C = 12, O = 16]
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3Cu + pHNO3 →3Cu(NO)2 + 4H2 O + xNO
In the equation above, the values of p and x respectively are
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What volume of oxygen is produced from the decomposition of 2 mole of KCIO3 at s.t.p?
[Molar volume of a gas at s.t.p = 22.4 dm3]
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For example: NaCl, KNO3, CaBr2, CsClO4
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