JAMB UTME - Chemistry - 1981

Which of the following statements about phosphorus is NOT correct?

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

For iron to rust, there should be present?

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

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)

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

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

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

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

Allotropes are elements having?

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

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

An example of a strong electrolyte is?

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

Which of the following can have an isomer?

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?

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

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

An efflorescent compound is a substance that?

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

Which of the following represents a precipitation reaction?

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

The IUPAC name for

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 ?

Methane is member of the homologous series called?

Fats and oils are?

Which of the following processes takes place during electrolysis?

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

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)

A polymerization reaction is one in which?

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

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?

The mass number of an atom is?

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?

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

The oxidation number of manganese in KMnO₄ is?

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)

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?

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

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?

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

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

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

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

Oxidation is the process of?

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

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

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

When air is compressed?

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