JAMB UTME - Chemistry - 1984
Tambaya 2 Rahoto
In which of the following reactions does hydrogen peroxide act as a reducing agent?
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Tambaya 3 Rahoto
At S. T. P how many litres of hydrogen can be obtained from the reaction of 500 cm3 of 0.5 M H 2SO 4 with excess zinc metal?
(Gram molecular volume of H2 = 22. 4 dm 3)
Tambaya 4 Rahoto
Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?
Tambaya 5 Rahoto
Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?
Tambaya 7 Rahoto
Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene
Tambaya 8 Rahoto
If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bring sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone
Tambaya 9 Rahoto
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
Tambaya 10 Rahoto
Sulphur
Tambaya 11 Rahoto
An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore cartion in M is
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Tambaya 12 Rahoto
For the reaction NH4NO2 → N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 320 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)
Tambaya 13 Rahoto
The I.U.P.A.C name for the compound is
Tambaya 14 Rahoto
A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear limewater milky. The sea shell contains
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Tambaya 15 Rahoto
Sodium hydroxide (NaOH) pellets are
Tambaya 16 Rahoto
For the reaction 2Fe3+ 2I- → 2Fe2+ + I2, which of the following statements is TRUE?
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Tambaya 17 Rahoto
The solubility curves of four substances are shown in the figure above. Which of the four substances would crystallize from a saturated solution cooled from 353K(80oC)to 323K(50C)?
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Tambaya 18 Rahoto
Which of the curves shown in the figure given represents the relationships between the volume(V) and pressure(P) of an ideal gas at constant temperature?
Tambaya 19 Rahoto
The diagram above (Fig.3) shows the energy profile for the reaction A + B + = C + D From this diagram, it is clear that the reaction is
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Tambaya 21 Rahoto
Which of the following statements is NOT true of carbon monoxide?
Tambaya 23 Rahoto
From the reactions : ZnO + Na2O → NaZnO and ZnO + CO2 → ZnCO3 it may be concluded that zinc oxide is
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Tambaya 24 Rahoto
If the cost of electricity required to deposit 1 g of magnesium is ₦5.00, how much would it cost to deposit 10g of aluminium?
Tambaya 25 Rahoto
Use the diagram above to answer this question.
Which of the following structural formula is NOT isomeric with the others?
Tambaya 26 Rahoto
Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of
Tambaya 27 Rahoto
Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over
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Tambaya 28 Rahoto
In the Haber process for the manufacture of ammonia, finely divided iron is used as
Tambaya 29 Rahoto
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?
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Tambaya 30 Rahoto
In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is - 57.3kJ. Therefore the heat of the reaction 2NaOH + H2SO4 ? Na2SO4 + 2H2O is
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NaOH + HCl = NaCl + H2O Δ H = -57.3kJ
Heat of reaction of 2NaOH + H2O4
NaSO4 + H2O is
= 57.3 x 2 = -114.6 kJ
Tambaya 31 Rahoto
20 cm 3 of hydrogen gas are sparked with 20cm 3 of oxygen gas in an endimoeter at 373k (100 oC) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 oC) and passed over calcium chloride. The volume of the residual gas is
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2H2 + O2 ------2H2O
2V 1V 2V
20cm3 20cm3 -------
20cm3 10cm3 20cm3
Residual gas = 20cm3 - 10cm3 of 02 = 103
Tambaya 33 Rahoto
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
Tambaya 34 Rahoto
An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is
Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )
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Tambaya 36 Rahoto
Which of the following mixtures would result in a solution of pH greater than 7?
Tambaya 37 Rahoto
The function of conc. H2SO4 in the esterification of ethanoic acid with ethanol is to
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Tambaya 38 Rahoto
Sodium chloride may be obtained from brine by
Tambaya 40 Rahoto
When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
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Tambaya 41 Rahoto
The hybridization of the carbon atom in ethyne is
Tambaya 42 Rahoto
An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.
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Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of these elements.
Tambaya 43 Rahoto
Use the diagram above to answer this question.
Which of the following represents a carboxylic acid?
Tambaya 44 Rahoto
Alkanes
Tambaya 45 Rahoto
Which of the following statements is NOT correct about all four of the acids: HBr, HNO3, H 2CO3 and H2SO4? They
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