JAMB Chemistry 1998 Past Questions

The addition of water to calcium oxide leads to?

A mixture of iron and sulphur can be separated by dissolving the mixture in?

A given amount of gas occupies 10.0 dm³ at atm, and 273°C. The number of moles of the gas present is?
(Molar volume of a gas at s.t.p. = 22.4 dm³)

8.0 g of an element X react with an excess of copper (ll) tetraoxosulphate (lV) solution to deposit 21.3 g of copper. The correct equation for the reaction is?

(Cu = 64).

C₃H_8(g) + 50_2(g) → 4H₂O + 3CO_2(g). Form the equation above the volume of oxygen at s.t.p. required to burn 50cm³ of propane is?

30cm³ of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?

If sulphur (IV) oxide and methane are released simultaneously at the opposite ends of a narrow tube, the rates of diffusion Rso₂ and Rch₄ will be in the ratio?

(S = 32, O = 16, C = 12, H = 1)

A solid begins to melt when?

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

The line observed in the sample hydrogen spectrum are due to emission of?

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

Potassium tetraoxomanganate (VII) is often added to impure water to?

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

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

If an element X of an atomic number Z and mass number Y is irradiated by an intense concentration of neutrons, the relevant nuclear equation is?

90.0g of MgCI₂ was placed in 50.0cm³ of water to give a saturated solubility of the salt is 8.0 mol dm³ at the same temperature, what is the mass of the salt left undissolved at the given temperature?

(Mg = 24, Cl = 35.5)

Soap lather is an example of a colloid in which a?

The pH of a solution obtained by mixing 100cm³ of a 0.2M solution of NaOH is?

Mg²⁺_(aq) + 2e^->_(aq) → Mg_(s)E°_(volts) = 2.370

Zn²⁺_(aq) + 2e^->_(aq) → Zn_(s)E°_(volts) = -0.763

Cds²⁺_(aq) + 2e^->_(aq) → Cd_(s)E°_(volts) = 0.403

Cu²⁺_(aq) + 2e^->_(aq) → Cu_(s)E°_(volts) = 0.340

In the electrochemical series above, the strongest reducing agents is?

2Cl^2(g) + 2H₂O_(g) 4HCl_(g) + O_2(g)
∆H° = +115KJ mol^-1. In the above equilibrium reaction, a decrease in temperature will?

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 the concentration of X is doubled. The correct equation for the reaction is?

A gas that turns a filter paper previously soaked in lead ethanoate solution black is?

3CuO_(s) + 2NH_3(g) → 3Cu_(s) + 3H₂O_(I) N_2(g) (i).

2NH_3(g) + 3Cl_2(g) → 6HCl_(g) + N_2(g) (ii).

4NH_3(g) + 3O_2(g) → 6H₂O_(I) + 2N_2(g) (iii).

The reactions represented by the equations above demonstrate the?

A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute?

The oxide that remains unchanged when heated in hydrogen is?

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

The metal that will react with water only in the form of steam to librate hydrogen gas is?

A common characteristic shared by iron and aluminium is that both?

Alloys are often used in preference to pure metals because?

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

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

How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C ₄H₁₀O?

An example of aromatic compound is?

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

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

The diagram above represents an atom that can combine with chlorine to form

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

In the experiment above, X could be a solution of