JAMB Chemistry 1989 past questions

Which of the following is a physical change?

Changes in the physical states of chemical substances T are shown in the scheme below. Liquid T Z Y Solid T X Gaseous T The letters X, Y and Z respectively represent

In the reaction: SnO2 + 2C Sn + 2CO the mass of coke containing 80% carbon required to reduce 0.032 kg of pure tin oxide is

The Avogadro’s number of 24 of magnesium is same as that of

What is the partial pressure of hydrogen gas collected over water at standard atmospheric pressure and 25oC if the saturation vapour pressure of water is 23 mm Hg at that temperature?.

The atomic radius Li, Na and K are 1:33 A m 1.54A and 1.96A respectively. Which of the following explain this gradation in atomic radius?

Which of the curves in the above graph illustrates the behaviors of an ideal gas?

Elements X and Y have electronic configurations 1s22s22p4 and 1s22s22p63s23p1 respectively. When they combine, the formula of the compound formed is

The atomic number of cesium is 55 and its atomic mass is 133. The nucleus of cesium atom therefore contains

Four elements P,Q,R and S have atomic numbers of 4, 10, 12, and 14 respectively. Which of these elements is a noble gas?

In the above set up, substances X and Y are respectively.

The gaseous pollutant sulphur (lV) oxide is most likely to be detected in fairly reasonable quantities in the area around a plant for the

Calcium hydroxide is added in the treatment of town water supply to

Using 50cm3 of 1 M potassium hydroxide and 100cm3 of 1M tetraoxosulphate(Vl) acid, calculate the respective volumes in cm3 of bade and acid 100 cm3 of base and acid that would be required to produce the maximum amount of potassium tetraoxosulphate(Vl)

The substance of ZnO dissolves in sodium hydroxide solution and mineral acid solution to gives soluble products in each case. ZnO is therefore referred to as.

An acid its conjugate base .

What is discharged at the cathode during the electrolysis of copper (ll) tetraoxosulphate (Vl) solution?

An element, Z forms an anion whose formula is [Z(CN)6]y. If has an oxidation number of +2, what is the value of y?

Which of the reaction is NOT an example of a redox reaction? I Fe + 2Ag+ Fe2+ + 2Ag+ II 2H2S + SO2 2H2O + 3S III N2 + O2 2NO IV CaCO3 CaO + CO2

The above diagram gives the potential energy profile of the catalyzed uncatalysed reactions of X(g) + Y(g) XY(g) . Deduce the respective activation energies in kJ of the catalyzed and uncatalysed reverse reactions. XY(g) + X(g) X(g) + Y(g)

The combustion of ethene, C2H2, is given by the equation C2H4 2CO2 + 2H2O; H = -1428 kJ. If the molar heats of formation of water and carbon (l) oxide are –286kJ and –396 kJ respectively. Calculate the molar heat of formation of ethane in kJ.

CO(g) + H2O CO2(g) + H2(g) H = -41000 J. Which of the following factors favour the formation of hydrogen in the above reaction? I high pressure II low pressure III high temperature IV use of excess steam

The above graph shows a typical heating curve from the solid phase through the liquid phase to the gaseous phase of a substance . What part of the curve shows solid and liquid in equilibrium?

Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonirate (V) acid?

The catalyst used in the contact process for the manufacture of tetraoxosulphate(Vl) acid is

Some products of destructive distillation of coal are

Gunpowder is made from charcoal, sulphur and potassium trioxonirate (V). The salt in the mixture performs the function of

Bleaching powder, CaOCl2.H2O, deteriorates on exposure to air because

The product of the thermal decomposition of ammonium trioxonirate (V) are.

The scale of a chemical balance is made of iron plate and coated with copper electrolytically because.

Mortar is NOT used for under-water construction because.

Which of the following is NOT involved in the extraction of metals from their ores?

When excess chlorine is mixed with ethene at room temperature, the product is

Vulcanization of rubber is a process by which

The reaction between ethanoic acid and sodium hydroxide is an example of

The bond which joins two ethanoic acid molecules in the liquid state is

The alkaline hydrolysis of fats and oils produces soap and

What is the IUPAC name for the compound CH3 CH2 = C CH2CI

The gas responsible for most of the fatal explosion in coal mines is

Three liquids X,Y and Z containing only hydrogen and carbon were burnt on a spoon, X and Y burnt with sooty flames while Z did not. Y is able to discharge the colour of bromine water whereas X and Z cannot. Which of the liquids would be aromatic in nature?