JAMB UTME - Chemistry - 1978

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;

Which of the following changes is physical?

An experiment test of the Law of conservation of Mass is illustrated in the diagram. In practice, the flask is weighed before and after reaction between solutions X and Y. Which of the following pairs of solutions will be unsuitable for the experiments

Five compounds R,T,W,X and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, atmospheric oxide W₂O₃, XO₂. which of the elements is an alkali

A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

When heat is absorbed during a chemical reaction, the reaction is said to be

The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;

Hypochlorous acid is used as a bleach because

You are provided with five gas jars containing SO₂, CO₂, H₂, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely

If 30cm³ of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm³ of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

A small quantity of solid ammonium chloride (NH₄Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone

Which of the following is not a member of the homologous series of the paraffins (alkanes)?

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

When each of the nitrates of Potassium, Magnesium and iron is heated,

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by

An example of an alcohol is

The oxidation state of chlorine in potassium chlorate is

Consider the following exothermic reaction
2SO_2(g) + O_2(g) ↔ 2SO_3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

Which of the following gases may not be dried with concentrated sulphuric acid?

The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?

Zinc Oxide is a

An element X forms the following compounds with chlorine; XCl₄, XCl₃, XCl₂. This illustrates the

The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

When sodium chloride and metallic sodium are each dissolved in water

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

Consider the following equation H₂O + 2Fe²⁺ + Cl₂ ↔ 2Fe³⁺ + 2Cl^- + H₂O. The only ion which behaves as an oxidising agent is

The most common type of chemical reaction which alkanes undergo is

Consider the solubility curves of three salts X, Y and Z given in the diagram. If each solution of the salt contains 200 g, and is heated to 100^oC, which solution or solutions will deposit 100 g of the solute when suddenly cooled to 0^oC?

Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

The nucleus of an atom contains

Which of the following compounds will form a solution if exposed to air?

A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

Which of the following metals cannot replace hydrogen from water or steam?

The normal boiling point of a liquid is defined as

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because

In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

The periodic classification of elements is an arrangement of the elements in order of their