JAMB UTME - Chemistry - 1981

In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?

Antwoorddetails

If an organic compound decolorizes bromine water then the compound is?

Antwoorddetails

If one mole of aluminium contains 6 x 10²³ atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)

Antwoorddetails

Methane is member of the homologous series called?

Antwoorddetails

Sodium and potassium belong to the same group of the Periodic Table. This is because?

Antwoorddetails

Pure sulphuric acid is a liquid of 1:84 density. What volume of it would be required to prepare 250 cm³ of 2.0 M solution?



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

Antwoorddetails

Which of the following processes takes place during electrolysis?

Antwoorddetails

Oxidation is the process of?

Antwoorddetails

What mass of sodium carbonate solution is in 500 cm³ of 0.1 molar sodium carbonate solution?

(Na = 23, C = 12, O = 16)

Antwoorddetails

Na₂CO₃ + 2HCI → 2NaCI + H₂O + CO₂. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?
(1 mole of gas occupies 22.4 dm³ at s.t.p)
(Na = 23, C = 12, O = 16)

Antwoorddetails

The following compounds are given with their corresponding boiling points.
Compound Boiling Point
i.................................14°C
ii................................24°C
iii................................0°C
iv................................120°C
V.................................-2°C
From the above information, indicate which of the following is correct?

Antwoorddetails

When sodium nitrate dissolves in water, ∆H is positive. This means that?

Antwoorddetails

The mass number of an atom is?

Antwoorddetails

If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is?

Antwoorddetails

An efflorescent compound is a substance that?

Antwoorddetails

The IUPAC name for

Antwoorddetails

Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?

Antwoorddetails

An element X has 127 neutrons and 82 electrons.
Its atomic number is?

Antwoorddetails

A polymerization reaction is one in which?

Antwoorddetails

Allotropes are elements having?

Antwoorddetails

Which of the following represents a precipitation reaction?

Antwoorddetails

In the preparation of ammonia, which of the following is used as the drying agent?

Antwoorddetails

The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?

Antwoorddetails

What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?

Antwoorddetails

Which of the following statements about phosphorus is NOT correct?

Antwoorddetails

28.8 cm³ of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?

Antwoorddetails

When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?

Antwoorddetails

In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

Antwoorddetails

The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?

Antwoorddetails

5cm³ of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?

(Na = 23, Cl = 35.5)

Antwoorddetails

When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?

Antwoorddetails

Fats and oils are?

Antwoorddetails

The oxidation number of manganese in KMnO₄ is?

Antwoorddetails

The general formula of an alkyl halide (which represent the halide) is?

Antwoorddetails

Which of the following statements is NOT true of electrovalent compounds?

Antwoorddetails

When air is compressed?

Antwoorddetails

Which of the following is NOT a true statement of the kinetic Theory of Gases?

Antwoorddetails

An example of a strong electrolyte is?

Antwoorddetails

Which of the following compounds and elements would sublime on exposure to the atmosphere?

Antwoorddetails

4g each of aluminium foil and aluminium powder were introduced respectively into flasks P and Q.
Flask P was treated with warm bench sodium hydroxide and all the aluminium dissolved in one hour. Flask Q was treated with cold sodium hydroxide and all the aluminium dissolved in 10 minutes. What was responsible for Q reacting faster than P?

Antwoorddetails

The scale formation in a kinetic used for boiling water is caused by the presence in water of?

Antwoorddetails

In the reaction
C + 2HNO₃ → CO₂ + NO₂ + NO + H₂O nitric acid is acting as?

Antwoorddetails

Which of the following can have an isomer?

Antwoorddetails

For iron to rust, there should be present?

Antwoorddetails

the number of atoms in one mole of a substance is equal to?

Antwoorddetails

If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?

Antwoorddetails

When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?

Antwoorddetails

Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)

Antwoorddetails

The brown coloration in nitric acid prepared in the laboratory can be removed by?

Antwoorddetails