JAMB Chemistry 1997 Past Questions

35 cm³ of hydrogen was sparked with 12 cm³ of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?

2.85g of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of?

An element, X, forms a volatile hydride XH₃ with a vapour density of 17.0. The relative atomic mass of X is?

(H = 1)

A mixture of 0.20 mole of Ar, 0.20 mole of N₂ and 0.30 mole of He exerts a total pressure of 2.1 atm. The partial pressure of He in the mixture is?

The temperature of a body decreases when drops of liquid placed on it evaporate because?

The electron configuration of two elements with similar chemical properties are represented by?

In the periodic table, what is the property that decreases along the periodic and increases down the group?

Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound P_xQ_Y. The respective values of x and y are?

Oxygen is a mixture of two isotopes O and O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?

If 30cm³ of oxygen diffuses through porous plug in 7s, how long will it take 60 cm³ of chlorine to diffuse through the same plug?

200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
When cooled, the final volume of air recorded was 158cm³. Estimate the percentage of oxygen in the air?

On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO₄. yH₂O. The value of y is?

(Mg = 24, S = 32, O = 16, H = 1)

Which of the following gases is the most dangerous pollutant?

A major process involved in the softening of hard water is the?

A saturated solution of AgCl was found to have a concentration of 1.30 x 10^-5 mol dm^-3. The solubility product of AgCl therefore is?

The hydroxyl ion concentrated, (OH^-), in a solution of sodium hydroxide of pH 10.0 is?

Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?

Given that 15.00 cm³ of H₂
SO₄ was required to completely neutralize 25.00 cm³ of 0.125 mol dm^-3 NaOH, calculate the molar concentration of the acid solution:

When platinum electrodes are used during the electrolysis of copper (ll) tetraoxosulphate (lV) solution, the solution gets progressively?

How many Faraday of electricity are required to deposit 0.20 mole of nickel, if 0.10 Faraday of electricity deposited 2.98g of nickel during electrolysis of its aqueous solution?

(Ni = 58.7, 1F = 96 500 C mol^-)

What is the oxidation number of Z in K₃ZCl₆?

2H₂S_(g) + SO_2(g) + H₂O_(I) → 3S_(s) + 3H₂O_(I)..........(i) 3CuO_(s) + 2NH_3(g) → 3Cu_(s) + 3H₂O_(I) + N_2(g).........(II) In the equations above, the oxidizing agent (I) and the reducing agent in (II) respectively are?

2SO_2(g) + O_2(g) 2SO₃. In the reaction above, the standard heats of formation of SO_2(g) and SO_3(g) are -297 KJ mol^-1 respectively. The heat change of the reaction is?

If the rate law obtained for a given reaction is rate = k(X)ⁿ (Y)^m, what is the overall order of the reaction?

One method of driving the position of equilibrium of an endothermic reaction forward is to?

Oxidation of concentrated hydrochloric acid with manganese (IV) oxide liberates a gas used in the?

mE + nF → pG + qH. In the equation above, the equilibrium constant is given by?

A compound that will NOT produce oxygen on heating is?

Coal gas is made up of carbon (II) oxide, hydrogen and?

2X_(aq) + MnO_2(s) + 4H⁺_(aq) → X_2(g) + Mn²⁺_(aq) + 2H₂O.
The reaction above can be used for the laboratory preparation of all halogens except fluorine because it is?

The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the?

Which of the additives could improve the quality of steel?

Sodium hydroxide is prepared commercially from sodium chloride solution by?

A sample of a substance containing only C and H burns in excess O₂ to yield 4.4g of CO₂
and 2.7 g of H₂O. The empirical formula of a substance is?

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

An undesirable paraffin in the petroleum industry which is particularly prone to knocking is?

The reaction of an alkanol with an alkanoic acid in the presence of concentrated H₂SO₄ will produce an?

The final product of the reaction of ethyne with hydrogen iodine is?

Synthetic rubber obtained by the polymerization of chlorobutadiene in the presence of sodium is called?

The synthetic detergents are preferred to soap for laundry using hard water because?

25 cm³ of 0.02 M KOH neutralized 0.03 g of a monobasic organic acid having the general formula C_nH_{2n + 1} COOH. The molecular formula of the acid is?

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

(1 /(2) N_2(g) + (1) / (2)O_2(g) → NO_(g) ∆H° 89 KJ mol^-. If the entropy change for the reaction above at 25°C is 11.8 J mol^-, calculate the change in free energy. ∆G°, for the reaction at 25°C?

Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR. The section PQ indicates that X is

Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR.The section OP suggests that X is in the

In the diagram above the gas Y could be

The IUPAC nomenclature of the organic compound with the above structural formula is

How many more isomers of the compound above can be obtained ?

Choose the correct answer from the options above. When Fehling is solution is added to two isomeric carbonyl compounds X and Y with the molecular formula C ₅H ₁₀O, compound X gives a red precipitate while Y does not react. It can be inferred that X is

The compound above contains

The compound above is the product of the oxidation of