JAMB UTME - Chemistry - 1981

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)

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?

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

An efflorescent compound is a substance that?

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

Methane is member of the homologous series called?

Which of the following statements about phosphorus is NOT correct?

When air is compressed?

Oxidation is the process of?

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

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

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)

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

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

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

The oxidation number of manganese in KMnO₄ is?

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

Which of the following represents a precipitation reaction?

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?

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

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

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

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?

An example of a strong electrolyte is?

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

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

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 ?

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

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

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

Fats and oils are?

The mass number of an atom is?

Which of the following processes takes place during electrolysis?

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

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

The IUPAC name for

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

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?

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)

Allotropes are elements having?

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?

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

Which of the following can have an isomer?

A polymerization reaction is one in which?

For iron to rust, there should be present?

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

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

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

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

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