1991
30cm3 of oxygen at 10 atmospheres pressure is placed in a 20 dm3 container. Calculate the new pressure if temperature is kept constant?
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1991 JAMB UTME Chemistry Past Questions
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1991
In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law…
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1991
An iron ore is known to contain 70.0% Fe2O3. The obtain from 80kg of the ore is?(Fe = 56, O = 16)
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1991
Which of the following are mixtures?i. Petroleum ii. Rubber latex iii. Vulcanizer's solution iv. Carbon (II) sulphide
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1991
Which of the following can be obtained by fractional distillation?
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1991
The electronic configuration of an elements is 1s22s22p63s23p3. How many unpaired electrons are there in the element?
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1991
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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1991
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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1991
A given quantity of a gas occupies a volume of 228 cm3 at a pressure of 750mm Hg. What will be its volume at atmospheric pressure?
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1991
Calculate the volume of carbon (IV)oxide measured at s.t.p, produced when 1 kg of potassium hydrogen trioxocarbonate (IV) is totally decomposed by heat?(G.M.V. at s.t.p 22.4 dm3, K = 39, O = 16, C = 12, H = 1)
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1991
Which of the following ions is a pollutant in drinking water even in trace amounts?
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1991
A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of?
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1991
Which of the following is arranged in order of increasing electronegativity?
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1991
Which of the following represents the type of bonding present in ammonium chloride molecule?
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1991
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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1991
How many structural isomers can be written for the alkyl bromide, C4H9Br?
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1991
50 cm3 of sulphur (IV) oxide, 800 cm3 of ammonia, 450 cm3 of hydrogen chloride, 1.0 cm3 of at 15°C. Which of the following is suitable for demonstrating the fountain experiment?
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1991
A property of a colloidal dispersion which a solution does not have is?
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1991
A sample of temporary hard water can be prepared in the laboratory by?
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1991
The solubility of copper (II) tetraoxosulphate (Iv) is 75g in 100g of water at 100°C and 25g in 100g of water at 30°C. What mass of the salt would crystallize, if 50g of copper (II) tetraoxosulphate (VI) solution saturat…
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