JAMB Chemistry 2005 Past Questions

Which of the following equimolar solutions will have the highest pH?

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

Phenolphthalein in acidic solution is

When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is

In which of the following reactions can the oxidation number of the nitrogen be said to have increased?

2H₂ + O₂2 → H₂+O ΔH = -571kJ
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?

A concentrated solution containing H⁺, Cu²⁺, OH^- and Cl^- was electrolyzed using platinum electrodes.
The ion that will be discharged at the cathode is

When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of

What is the correct IUPAC name for NO₂^-?

What will happen if an aluminium spoon is used to stir a solution of iron (II) trioxonitrates (V)?

The enzymes responsible for converting sucrose into two simple isomeric sugars is

The decolourization of purple colour of tetraoxomanganate (VII) ion is a test for

Which of the following are structural isomers?

In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove

How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?

Equal moles of ethyne and hydrogen iodide react to give

A substance that is used as a ripening agent for fruits is

When water boilers are used for long period of time, the solid substances left behind as scale are

25cm³ of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air

The solubility curve shows the variation of solute concentration with

The air around smelting industries is likely to contain

Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it

The gas that is the most dangerous pollutant to human is

Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and

How many moles of limestone will be required to produce 5.6g of CaO?
[Ca = 40, C = 12, O= 16]

The shape of the hydrocarbon compound CH₄ is

Which of these properties gives a solid its definite shape?

Sugar is separated from its impurities by

The component of an atom that contributes least to its mass is the

An element wil readily form an electrovalent compound if it electron configuration is

A heterogenous mixture can be defined as any mixture

The pressure of 100cm³ of oxygen at 35^oC is 750mmHg. What will be the volume of gas if the pressure is reduced to 100mmHg without changing the temperature?

I. Treatment of cancer
II. Detection of leakages in water mains
III. Detection of the ages of ancient tools
IV. Preparation of drugs
Which combination of the above refers to the uses of radioactive isotopes?

What is the valence shell electron configuration of the element with atomic number 17?

The density of a certain gas is 1.98gdm^-3 at s.t.p. What is the molecular mas of the gas?

When pure aluminium metal is heated to red hot in the presence of nitrogen gas, the compound formed is

A dense white fume is formed when ammonia gas reacts with

N_2(g) + 3H_2(g) ↔ 2NH_3(g) ΔH = -90 kJ
In the equation above, the yield of ammonia can be decreased by

The gas that can be dried using concentrated tetraoxosulphate (VI) acid is

NH₄Cl_(s) ↔ NH_3(g) + HCL_(g)
The reaction above can only attain equilibrium if

The most suitable metal that can be used as lightning conductor is

In the diagram above which of the cures illustrates Arrhenius' law?

The most abundant element on the earth's crust is

Metalliods are also referred to as

The ores that can be concentrated by flotation are

The property used in the industrial preparation of nitrogen and oxygen from air is

In a flame test for calcium, the flame appears

Which of the following alloys contain iron?

To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be