JAMB UTME - Chemistry - 1979
Tambaya 1 Rahoto
Pick out the correct statement
Tambaya 2 Rahoto
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?
Tambaya 3 Rahoto
The solution of a sample in a tube will be identified as a chloride if it gives
Bayanin Amsa
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.
Tambaya 4 Rahoto
Two metallic ions associated with hard water are
Tambaya 5 Rahoto
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]
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Tambaya 6 Rahoto
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
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Tambaya 7 Rahoto
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?
Tambaya 8 Rahoto
How many grams of HBr would exactly be required to react with 2 g of propyne? (C =12, H=1, Br = 80)
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Tambaya 10 Rahoto
Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by
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Tambaya 11 Rahoto
\(50cm^{3}\) of hydrogen are sparked with \(20cm^{3}\) of oxygen at \(100°C\) and \(1atm\) . The total volume of the residual gases in
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Tambaya 12 Rahoto
When a piece of charcoal enclosed in a cylinder containing air is ignited
Tambaya 13 Rahoto
The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N=14.0,O=16.0)
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Tambaya 14 Rahoto
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
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Tambaya 16 Rahoto
Which are the correct IUPAC names for H-CO2CH3 and CH = CH
Tambaya 17 Rahoto
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?
Tambaya 18 Rahoto
In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathode are:
Anode Cathode
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Tambaya 19 Rahoto
Helium atoms are chemically unreactive because
Tambaya 21 Rahoto
Which of the following substances are all made by the process of polymerization?
Tambaya 24 Rahoto
Which of the following statements applies during the electroysis of sodium hydroxide sodium hydroxide solution using platinum electrodes?
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Tambaya 25 Rahoto
Which of the following statements is true?
Tambaya 26 Rahoto
Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?
Tambaya 27 Rahoto
The reaction between hydrogen and iodine may be represented by the equation H2(g)+ I2(g) → 2HI(g), and is exothermic. Therefore
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Tambaya 28 Rahoto
On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?
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Tambaya 29 Rahoto
Bronze is an alloy of
Tambaya 30 Rahoto
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
Tambaya 31 Rahoto
The reaction 3C(s) + 2Fe2O3(s) = 4Fe(s) + 3CO2(g): \(\Delta\)H =46.0 kJ is
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Tambaya 32 Rahoto
If chlorine gas is bubbled into water and then this yellowish-green coloured solution is exposed to bright sunlight for a while
Tambaya 33 Rahoto
When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is
Tambaya 35 Rahoto
The IUPAC name for
Tambaya 36 Rahoto
Indicate which of the following statements is not true as we move from left to right along the periodic Table:
Tambaya 37 Rahoto
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?
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Tambaya 38 Rahoto
When ammonium, potassium and calcium carbonates are each separately heated
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Tambaya 39 Rahoto
A gas occupies 30.0 dm3 at S.T.P. What volume would it occupy at 91oC and 380 mm Hg?
Tambaya 40 Rahoto
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
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Tambaya 41 Rahoto
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
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Tambaya 42 Rahoto
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
Tambaya 43 Rahoto
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
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Tambaya 45 Rahoto
the vapour density of a gas may be defined as
Tambaya 46 Rahoto
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
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Tambaya 47 Rahoto
Hydrogenation may be effected by
Tambaya 48 Rahoto
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]
