JAMB UTME - Chemistry - 1979
Pregunta 1 Informe
When ammonium, potassium and calcium carbonates are each separately heated
Detalles de la respuesta
Pregunta 2 Informe
Which one of these compounds will NOT give an oxygen gas on heating?
Detalles de la respuesta
Pregunta 4 Informe
In the manufacture of iron in the blast furnace, iron (lll) oxide is mixed with coke and limestone, and different reactions occur in the process. Which of the following statements is true with respect to these reactions?
Detalles de la respuesta
Pregunta 5 Informe
Which of the following substances are all made by the process of polymerization?
Detalles de la respuesta
Pregunta 6 Informe
Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by
Detalles de la respuesta
Pregunta 7 Informe
A piece of metal (M) is dissolved in nitric acid and the resulting solution is treated with a small quantity of sodium hydroxide to produce a white precipitate (B) which redissolves on the addition of excess alkali. The precipitate (B)when ignited in a crucible produces the oxide of the metal(m). The METAL M is
Detalles de la respuesta
Pregunta 8 Informe
Indicate which of the following statements is not true as we move from left to right along the periodic Table:
Detalles de la respuesta
Pregunta 10 Informe
When a piece of charcoal enclosed in a cylinder containing air is ignited
Detalles de la respuesta
Pregunta 11 Informe
The reaction between hydrogen and iodine may be represented by the equation H2(g)+ I2(g) → 2HI(g), and is exothermic. Therefore
Detalles de la respuesta
Pregunta 12 Informe
\(50cm^{3}\) of hydrogen are sparked with \(20cm^{3}\) of oxygen at \(100°C\) and \(1atm\) . The total volume of the residual gases in
Detalles de la respuesta
Pregunta 15 Informe
Which of the following statements is true? When the potassium atom forms its ion
Detalles de la respuesta
Pregunta 17 Informe
The reaction 3C(s) + 2Fe2O3(s) = 4Fe(s) + 3CO2(g): \(\Delta\)H =46.0 kJ is
Detalles de la respuesta
Pregunta 18 Informe
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
Detalles de la respuesta
Pregunta 19 Informe
The solution of a sample in a tube will be identified as a chloride if it gives
Detalles de la respuesta
The solution of a sample in a tube will be identified as a chloride if it gives a white precipitate when acidified with dilute HNO3 and then AgNO3 solution is added. This is because the test is a confirmatory test for chloride ions, and the white precipitate formed is silver chloride (AgCl). Chloride ions react with silver nitrate (AgNO3) to form a white precipitate of AgCl, which is insoluble in water and dilute nitric acid.
Pregunta 20 Informe
Consider the following exothermic reaction 2SO2(g) + O2(g) = 2SO3 (g) . If the temperature of the reaction is reduced from 800oC to 500oC, and no other change takes place, then
Detalles de la respuesta
Pregunta 21 Informe
If chlorine gas is bubbled into water and then this yellowish-green coloured solution is exposed to bright sunlight for a while
Detalles de la respuesta
Pregunta 23 Informe
Weighed salts Y and Z were left exposed in the laboratory overnight. In the morning Y had gained weight, and Z had become liquid. What conclusion could be drawn about the nature of the two salts?
Detalles de la respuesta
Pregunta 24 Informe
Which of the following statements applies during the electroysis of sodium hydroxide sodium hydroxide solution using platinum electrodes?
Detalles de la respuesta
Pregunta 26 Informe
0.1 Faraday of electricity was passed through a solution of copper (ll) sulphate. The maximum weight of copper deposited on the cathode would be [Cu = 64]
Detalles de la respuesta
Pregunta 27 Informe
Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?
Detalles de la respuesta
Pregunta 29 Informe
An organic compound X has the following properties: I. It is not miscible with water. ll. lt has boiling point of 77oC lll. lt has a sweet odour lV. lt is insoluble in sodium hydrogen carbonate solution . V lt does not decolourize bromine water X is therefore
Detalles de la respuesta
Pregunta 30 Informe
In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathode are:
Anode Cathode
Detalles de la respuesta
Pregunta 31 Informe
12 g of solid protassium chlorate (KCIO) were added to 40 g of water and heated to dissolve all the solid. As the solution cools, crystals of potassium chlorate at 66 oC. The solubility of potassium chlorate at 66 oC is therefore
Detalles de la respuesta
Pregunta 32 Informe
Phosphorus burns in oxygen according to the equation P4 + 502 → P4O10. How many litres of oxygen will be required at S.T.P for complete oxidation of 12.4g of phosphorus? [P = 31,O = 16 and molar volume of a gas at S.T.P = 22.4 litres]
Detalles de la respuesta
Pregunta 34 Informe
Which are the correct IUPAC names for H-CO2CH3 and CH = CH
Detalles de la respuesta
Pregunta 35 Informe
A gas occupies 30.0 dm3 at S.T.P. What volume would it occupy at 91oC and 380 mm Hg?
Detalles de la respuesta
Pregunta 36 Informe
The reaction of zinc with copper (ll) ions in aqueous solution can be represented as follows: Cu 2+(aq) +Zn (s) → Cu(s) + Zn 2+(aq).Which of the following is the most complete description of this reaction?
Detalles de la respuesta
Pregunta 39 Informe
The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N=14.0,O=16.0)
Detalles de la respuesta
Pregunta 40 Informe
The oxidation state of manganese in potassium permanganate is
Detalles de la respuesta
Pregunta 41 Informe
One of the following techniques can be used to show that chlorophyll pigment is a mixture of chemical compounds and not a single coloured compound
Detalles de la respuesta
Pregunta 42 Informe
On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?
Detalles de la respuesta
Pregunta 43 Informe
Which of the structural formal above is ethanoic acid is
Detalles de la respuesta
Pregunta 44 Informe
When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is
Detalles de la respuesta
Pregunta 46 Informe
How many grams of HBr would exactly be required to react with 2 g of propyne? (C =12, H=1, Br = 80)
Detalles de la respuesta
Pregunta 47 Informe
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
Detalles de la respuesta
Pregunta 48 Informe
When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reason for this is
Detalles de la respuesta
Pregunta 49 Informe
Methanoic acid mixes with water in all proportions and has about the same boiling point as water which of the following methods would you adopt to obtain pure water from a mixture of stand, water and methanoic acid?
Detalles de la respuesta
