JAMB UTME - Chemistry - 1981

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

The mass number of an atom is?

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)

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 ?

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

Fats and oils are?

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

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

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

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

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)

Which of the following statements about phosphorus is NOT correct?

When air is compressed?

Allotropes are elements having?

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

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 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?

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?

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

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

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

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

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?

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

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

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?

Oxidation is the process of?

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

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

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

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

Methane is member of the homologous series called?

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

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

For iron to rust, there should be present?

Which of the following can have an isomer?

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

The oxidation number of manganese in KMnO₄ is?

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

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

An example of a strong electrolyte is?

The IUPAC name for

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?

A polymerization reaction is one in which?

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

Which of the following represents a precipitation reaction?

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

An efflorescent compound is a substance that?

Which of the following processes takes place during electrolysis?

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