JAMB UTME - Chemistry - 1981

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

Awọn alaye Idahun

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?

Awọn alaye Idahun

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

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

Awọn alaye Idahun

Which of the following statements about phosphorus is NOT correct?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

When air is compressed?

Awọn alaye Idahun

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

Awọn alaye Idahun

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?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

The mass number of an atom is?

Awọn alaye Idahun

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?

Awọn alaye Idahun

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

Awọn alaye Idahun

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?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

Which of the following can have an isomer?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

The IUPAC name for

Awọn alaye Idahun

The oxidation number of manganese in KMnO₄ is?

Awọn alaye Idahun

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?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

Fats and oils are?

Awọn alaye Idahun

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 ?

Awọn alaye Idahun

A polymerization reaction is one in which?

Awọn alaye Idahun

For iron to rust, there should be present?

Awọn alaye Idahun

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)

Awọn alaye Idahun

An example of a strong electrolyte is?

Awọn alaye Idahun

Which of the following processes takes place during electrolysis?

Awọn alaye Idahun

Oxidation is the process of?

Awọn alaye Idahun

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

Awọn alaye Idahun

Allotropes are elements having?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

Which of the following represents a precipitation reaction?

Awọn alaye Idahun

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)

Awọn alaye Idahun

An efflorescent compound is a substance that?

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

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

Awọn alaye Idahun

Methane is member of the homologous series called?

Awọn alaye Idahun

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)

Awọn alaye Idahun