JAMB UTME - Chemistry - 1984

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

Which of the following statements is INCORRECT?

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

Sodium chloride may be obtained from brine by

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

Use the diagram above to answer this question.

Which of the following represents a carboxylic acid?

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?

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

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

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

When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as

Alkanes

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

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

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

Answer Details

2H2 + O2 ------2H2O
2V 1V 2V
20cm3 20cm3 -------
20cm3 10cm3 20cm3
Residual gas = 20cm3 - 10cm3 of 02 = 103

Which of the following statements is NOT correct about all four of the acids: HBr, HNO3, H 2CO3 and H2SO4? They

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)

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

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

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 )

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

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

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

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

Use the diagram above to answer this question.

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

Water is said to be 'hard' if it

Sodium hydroxide (NaOH) pellets are

The hybridization of the carbon atom in ethyne is

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)?

An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.

Answer Details

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.

Alkaline hydrolysis of naturally occurring fats and oils yields

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)

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

Answer Details

NaOH + HCl = NaCl + H2O $\Delta$H = -57.3kJ

Heat of reaction of 2NaOH + H2O4

NaSO4 + H2O is

= 57.3 x 2 = -114.6 kJ

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

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

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

The name of the compound above is

Sulphur

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

A molar solution of caustic soda is prepared by dissolving

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?

An example of a neutral oxide is

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

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

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