JAMB Chemistry 1999 past questions

Sieving is a technique used to separate mixtures containing solid particles of

Which of the following gases will diffuse fastest when passed through a porous plug?

Which of the compounds is composed of Al, Si, O and H?

Which of the following will have its mass increased when heated in air?

50cm3 of carbon (11) oxide was exploded with 150cm3 of air containing 20% oxygen by volume, which of the reactants was in excess?

What is the temperature of a given mass of a gas initially OoC and 9 atm, if the pressure is reduced to 3 [PAGE 54] atmosphere at constant volume?

In the diagram above, the mixture of the two solid P and Q can be separated by

The ratio of the initial to the final pressure of a given mass of gas is 1:1:5. Calculate the final volume of the gas if the initial volume was 300cm3 at the same temperature.

Mg(s) + 2HCl (aq) MgCl2(aq) + H2(g). From the equation above, the mass of magnesium required to react with 250cm3 of .5 M HCl is

The partial pressure of oxygen in a sample of air is 452mm Hg and the total pressure is 780mmHg. What is the mole fraction of oxygen?

The fundamental difference between the three states of matter is the

In which of the following are water molecules in the most disorderly arrangement?

Which of the following the following statements is correct about the periodic table?

In order to remove one electron from 3s-orbital of gaseous sodium atom, about 496 kJ mol-1 of energy is required. This energy is referred to as

The method that can be used to convert hard water to soft water is

The element that is likely to participate in covalent rather than ionic bonding is

The least reactive elements is

ls22s22p63s23p63d74s2. An element with the electron configuration above is a

Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?

0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up to 0.50dm3. If 15.00cm3 of the solution requires 12.50 cm3 of aqueous sodium trioxocarbonate (1V0 for neutralization, calculate the concentration of the alkaline solution.

The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O7, V2O5 and KmnO4 is

The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is

What is observed when aqueous solution of each of tetraoxosulphate(V1) acid, potassium trioxides (V) and potassium iodine are mixed together?

From the diagram above, the mass of crystals [PAGE 55] deposited when 1 dm3 of a saturated solution of NaCl is cooled from 80oC to 60oC is

The solution with the lowest pH value is

The solubility product of Cu(lO3)2 is 1.08 x 10-7. Assuming that neither ions react appreciably with water to form H+ and OH-, what is the solubility of this salt?

The entropy and enthalpy of a system are a measure of

2SO2(g) + O2(g) 2NO2(g). In the chemical reaction above, the substance that will increase the rate of production of sulphur (V1) oxide is

What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?

When a current 1 was passed through an electrolyte solution for 40 minutes, a mass Xg of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 21 is passed through the solution for 10 minutes?

RS(aq) + HF (aq) RF(s) + HS(aq) H =-65.7 kJ mol1. From the equation above, it can be deduced that.

Which of the following statements is true of the electrochemical series?

The gas that will form a white precipitate with acidified silver trioxonirate (V) is

Chlorine bromine and iodine resemble one another in that they

The salt that reacts with dilute hydrochloric which decolourizes acidified purple smelling gas which decolourizes acidified purple potassium tetraoxomanganate(V11) solution is

Hydrogen is used in oxy-hydrogen flames for melting metals because it

In the diagram above Y is mixture of

What properties of duralumin make it more useful than its constituent metals?

The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is

Which of the following metals is passive to concentrated trioxonirate(V) acid?

The hydrocarbon the burns in air with a sooty flame is

2-methylprop-1-ene is an isomer of

When excess ethanol is heated to 145oC in the presence of concentrated H2SO4 the product is

How many grammes of bromine will saturate 5.2 g of but-l-ene-3-yne?

Polyvinyl chloride is used to produced

An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be an

When two end alkyl groups of ethyl ethanoate are interchanged, the compound formed is known as

Which of the compounds above would react to take up two molecules of bromine during bromination?