JAMB UTME - Chemistry - 1991
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The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons.
How many protons are in the nuclei of the neutral atoms of X and Y respectively?
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Which of the following statements is TRUE of the complete hydrolysis of a glycerine by sodium hygroxide?
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The appropriate test paper to use in the above experiment is moist
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The data in the table above shows the rate of reaction of nitrogen (ll) oxide with chlorine at 25oC It can be concluded that doubling the initial concentration of NO increase the rate of reaction by a factor of
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.: The rate increase by a factor of 4
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Question 15 Report
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(36 + 4) (4 X 80)
40 g of C3H4 reacts with 320 g of Br
10 " " will react with
(10)/(40) x (320) /(1) = 80g
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50 cm3 of sulphur (lV) oxide, 800 cm3 of carbon (IV) oxide will respectively saturate 1.0cm3 of water at 15oC. Which of the following is suitable for demonstrating the fountain experiment?
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A sample of a gas exerts a pressure of 8.2 atm when confined in a 2.93 dm3 container at 20°C. The number of moles of gas in the sample is?
(R = 0.082 litre atm / deg mole)
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2.93 x 8.2 = 0.082 x 293 xn
∴ n = (2.93 x8.2) / (0.082 x 293)
n = 1
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Question 25 Report
CH3-CH-CH3
CH2CI Is known as?
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The elections or two atoms Y and Z are arranged in shes as shown above. The bond formed between the atoms of Y and Z is
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Atoms of element X (with 2 electrons in the outer shell). combine with atoms of Y (with 7 electrons in the outer shell).
Which of the following statements is FALSE? The compound formed
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Question 32 Report
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13.3 g = 216000 C
118.7 g = (216000 x118.7) / (13.3) = 1927759.4 C
06500 C - 1 mole
1927759.4 C = (1927759.4) / (96500) = 1.998 = 2
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Question 36 Report
NO(g) + CO(g) ↔ (1)/(2)N2(g) + CO2(g) ∆H = -89.3 kj.
What conditions would favour maximum conversion of nitrogen (II) oxide and carbon (II) oxide in the reaction above?
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Question 41 Report
Which of the following equimolar solutions, Na2CO3 Na2 SO
4CI FeCI3 CH3COONa,
Have pH greater than 7?
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1.1 g of CaCI2 dissolved in 50 cm3 of water caused a rise in temperature of3.4°C. The heat of reaction, ∆H for CaCI2 in kj per mole is?
(Ca = 40, CI = 35.5, specific heat of water is 4.18 jk-1
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Since Mn has 7 electrons on one side and 2 electrons on the other side. The value of ne- is 5.
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1g of Cl will combine with 1×0.20.32 = 0.56
0.71g of U combines with 0.49g of x
1g of U will combine with 1×0.471 = 0.56
Ratio 0.56 : 0.56 = 1:1
Question 46 Report
Which of the following are mixtures?
i. Petroleum
ii. Rubber latex
iii. Vulcanizer's solution
iv. Carbon (II) sulphide
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