JAMB UTME - Chemistry - 1984
Frage 3 Bericht
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
Frage 4 Bericht
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
Frage 5 Bericht
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
Antwortdetails
Frage 6 Bericht
The function of conc. H2SO4 in the esterification of ethanoic acid with ethanol is to
Antwortdetails
Frage 7 Bericht
From the reactions : ZnO + Na2O → NaZnO and ZnO + CO2 → ZnCO3 it may be concluded that zinc oxide is
Antwortdetails
Frage 8 Bericht
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?
Antwortdetails
Frage 9 Bericht
For the reaction 2Fe3+ 2I- → 2Fe2+ + I2, which of the following statements is TRUE?
Antwortdetails
Frage 11 Bericht
Sodium hydroxide (NaOH) pellets are
Frage 12 Bericht
The I.U.P.A.C name for the compound is
Frage 13 Bericht
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)?
Antwortdetails
Frage 14 Bericht
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
Antwortdetails
2H2 + O2 ------2H2O
2V 1V 2V
20cm3 20cm3 -------
20cm3 10cm3 20cm3
Residual gas = 20cm3 - 10cm3 of 02 = 103
Frage 15 Bericht
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?
Frage 16 Bericht
Sodium chloride may be obtained from brine by
Frage 17 Bericht
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)
Frage 18 Bericht
Which of the following mixtures would result in a solution of pH greater than 7?
Frage 19 Bericht
Which of the following statements is NOT correct about all four of the acids: HBr, HNO3, H 2CO3 and H2SO4? They
Antwortdetails
Frage 20 Bericht
Use the diagram above to answer this question.
Which of the following represents a carboxylic acid?
Antwortdetails
Frage 21 Bericht
In the Haber process for the manufacture of ammonia, finely divided iron is used as
Frage 22 Bericht
Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?
Antwortdetails
Frage 23 Bericht
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
Frage 25 Bericht
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
Antwortdetails
Frage 27 Bericht
Use the diagram above to answer this question.
Which of the following structural formula is NOT isomeric with the others?
Frage 29 Bericht
Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene
Frage 30 Bericht
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
Antwortdetails
Frage 31 Bericht
Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?
Antwortdetails
Frage 32 Bericht
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 )
Antwortdetails
Frage 33 Bericht
The hybridization of the carbon atom in ethyne is
Frage 34 Bericht
Alkanes
Frage 35 Bericht
An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.
Antwortdetails
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.
Frage 38 Bericht
In which of the following reactions does hydrogen peroxide act as a reducing agent?
Antwortdetails
Frage 39 Bericht
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?
Frage 40 Bericht
Which of the following statements is NOT true of carbon monoxide?
Frage 41 Bericht
Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of
Frage 42 Bericht
Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over
Antwortdetails
Frage 43 Bericht
When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
Antwortdetails
Frage 44 Bericht
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
Antwortdetails
NaOH + HCl = NaCl + H2O Δ H = -57.3kJ
Heat of reaction of 2NaOH + H2O4
NaSO4 + H2O is
= 57.3 x 2 = -114.6 kJ
Frage 45 Bericht
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)
