JAMB UTME - Chemistry - 1984

Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of

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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.

Sulphur

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Water is said to be 'hard' if it

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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

Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?

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In the Haber process for the manufacture of ammonia, finely divided iron is used as

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For the reaction NH4NO2 $\to$ 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)

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A molar solution of caustic soda is prepared by dissolving

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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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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?

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Which of the following statements is INCORRECT?

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Use the diagram above to answer this question.

Which of the following structural formula is NOT isomeric with the others?

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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?

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An example of a neutral oxide is

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The function of conc. H2SO4 in the esterification of ethanoic acid with ethanol is to

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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)

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The I.U.P.A.C name for the compound is

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Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over

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Sodium hydroxide (NaOH) pellets are

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In which of the following reactions does hydrogen peroxide act as a reducing agent?

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Which of the following statements is NOT true of carbon monoxide?

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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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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 $\Delta$H = -57.3kJ

Heat of reaction of 2NaOH + H2O4

NaSO4 + H2O is

= 57.3 x 2 = -114.6 kJ

Alkanes

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Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene

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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

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Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?

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3Cl2 + 2NH3 $\to$ N2 + 6HCl. In the above reaction, ammonia acts as

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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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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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The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is

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From the reactions : ZnO + Na2O $\to$ NaZnO and ZnO + CO2 $\to$ ZnCO3 it may be concluded that zinc oxide is

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The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is

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Sodium chloride may be obtained from brine by

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Alkaline hydrolysis of naturally occurring fats and oils yields

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For the reaction 2Fe3+ 2I- $\to$ 2Fe2+ + I2, which of the following statements is TRUE?

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Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?

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The name of the compound above is

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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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Use the diagram above to answer this question.

Which of the following represents a carboxylic acid?

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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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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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Which of the following mixtures would result in a solution of pH greater than 7?

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The hybridization of the carbon atom in ethyne is

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