JAMB Chemistry 1998 past questions

The addition of water to calcium oxide leads to

200 cm3 each of 0.1 M solution of lead (11) trioxonirate (V) and hydro chlorioc acid were mixed. Assuming that lead (11) chloride is completely insoluble, calculate the mass of lead (11) chloride that will be precipate.

56.00cm3 of a gas at s.t.p weighed 0.11 g, What is the vapour density of the gas?

8.0 g of an element X reacted with an excess of copper (11) tetraoxosulphate (1V) solution to deposit 21.3 g of copper. The correct equation for the reaction is

C3H8(g) + 5O2(g) 4H2O(g) +3CO2(G) From the equation abovem the volume of oxygen at s.t.p. required to burn 50cm3 of propane is

30cm3 of hydrogen was collected over water at 27oC and 780 mm Hg. If the vapour pressure of water at the temperature of the experiement was 10mm Hgm calcuale the volume of the gas at 760mm Hg and 70C.

If sulphur oxide and methane are released simultaneously at the opposite ends of narrow tube, the rates of diffusion Rso2 and RCH4 will be in the ratio

The diagram above represents an atom that can combine [PAGE 51] with chlorine to form

Which of the following electron configurations indicates an atom with the highest ionization energy?

The lines observe in the simple hydrogen spectrum are due to emission of

The property used in obtaining oxygen and nitrogen industrially from air is the

Excess phosphorus was burnt in gas jar and the residual gas passed successively over concentrated KOH solution and concentrated H2SO4 before being collected in a flask. The gases collected are

Potassium tetraoxomanganate (v11) is often added to impure water to

The soil around a battery manufacturing factory is likely to contain a high concentration of

90.0 g of MgCI2 was placed in 50.0cm3 of water to give a saturated solution at 298 K. If the solubility of the salt is 8.0-mol dm-3 at the same temperature, what is the mass of the salt felt undissolve at the given temperature?

Soap leather is an example of a colloid in which a

The pH of a solution obtained by mixing 100cm3 of a 0.1 M HCI solution with 100cm3 of a 0.2 M solution of NaOH is

In the conductance of aqueous potassium tetraoxosulphate (1V) solution, the current carriers are the

What volume of 0.1 mol dm-3 solution of tetraoxosulphate (1V) acid would be needed to dissolve 2.86 g of sodium trioxocarbonate (1V) decahydrate crystals?

1.2 of electricity are passed through electrolytic cells containing Na+, Cu2+ and AI3+ in series. How many moles of each metal would be formed at the cathode of each cell?

What mass of gold is deposited during the electrolysis of gold (111) tetraoxosulphate (V1)when a current of 15 A is passed for 193 seconds?

Fe(s) + Cu 2+ (aq) Fe2+ (aq) +Cu(s) From the reaction above it can be inferred that

2FeCI2(s) + CI2(g) 2FeCI3(s) The reducing agent in the reaction above is

The reaction that is accompanied by a decrease in entropy when carried out constant temperature is

32g of anhydrous copper 11 tetraoxosulphate (1V) dissolved in 1 dm3 of water generated 13.0kJ of heat. The heat of solution is

Mg2+ (ag) + 2e- (aq) Eo (volts) = -2.370 Zn2+ (ag) + 2e- (aq) Zn(s) Eo (volts) = -0.763 Cd2+ (ag) + 2e- (aq) Cd(s) Eo (volts) = -0.403 Cu2+ (ag) + 2e- (aq) Cu(s) Eo (volts) = +0.403 In the electrochemical series above the strongest reducing agent is

In the diagram above, the activation energy for the backward reaction is

2X(g) + Y(g) Z(g) In the equation above the rate of formation of Z is found to be independent of the concentration of Y and to quadruple when rate equation for the reaction is

2CI2(g) + 2H2O(g) 4HCI(g) +O2(g) Ho = +115kJ mol-1 In the above equilibrium reaction a decrease in temperature will.

3CuO(s) +2NH3(g) 3Cu(s) + 3H2O(1) + N2(g) (i) 2NH3(s) + 3CI2(g) 6HCI(s) + N(1) + H2O (ii) 4NH3(s) + 3CI2(g) 6H2O(I) + 2N2(g) + HCl The reactions represented by the equations above demonstrate the

In the experiment above, X could be a solution of

The oxide that remains unchanged when heated in hydrogen is

Which of the following is observed when a solution of Iron (111) chloride is mixed with a solution of sodium hydroxide?

Alloys are often used in preference to pure metals bacause

CH3 CH2 CHCH(CH3)2 The IUPAC nomenclature for the above compound is

Dehydration of CH3 CH2 CH2 CH2 OH gives

nCH2 =CH2 O2 (initiator) ( CH2 CH2 CH2 The above equation represents the manufacture of

One mole of a hydrocarbon contains 6 g of hydrogen. If the molecular weight is 54, the hydrocarbon is an.

The products obtained when a pure hydrocarbon is burn in excess oxygen are

On cracking medicinal paraffin, a gas is evolved which gives a pop sound with a lighted splinter and a oily liquid which decolourizes bromine solution is also obtained. The products of the cracking are

An example of aromatic compound is

Terylene is synthesized from ethane –1, 2- diol and benzene –1, 4- dicarboxylic acid by

H C C C C H H H H CH3 The compound above is the product of the oxidation of

Which of the following is true concerning the properties of benezene and hexane?