JAMB UTME - Chemistry - 1979
Tambaya 2 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 3 Rahoto
Which of the following statements applies during the electroysis of sodium hydroxide sodium hydroxide solution using platinum electrodes?
Bayanin Amsa
Tambaya 5 Rahoto
The IUPAC name for
Tambaya 7 Rahoto
Which of the following raw materials would be required from the smelting of iron ore in a blast furnace?
Tambaya 8 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]
Tambaya 9 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 10 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
Bayanin Amsa
Tambaya 11 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 12 Rahoto
The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N=14.0,O=16.0)
Bayanin Amsa
Tambaya 13 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?
Bayanin Amsa
Tambaya 16 Rahoto
Which of the following substances are all made by the process of polymerization?
Tambaya 17 Rahoto
Pick out the correct statement
Tambaya 18 Rahoto
When a piece of charcoal enclosed in a cylinder containing air is ignited
Tambaya 19 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 20 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
Bayanin Amsa
Tambaya 21 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
Bayanin Amsa
Tambaya 22 Rahoto
Which of the following statements is true?
Tambaya 23 Rahoto
Indicate which of the following statements is not true as we move from left to right along the periodic Table:
Tambaya 24 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 25 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
Bayanin Amsa
Tambaya 26 Rahoto
If chlorine gas is bubbled into water and then this yellowish-green coloured solution is exposed to bright sunlight for a while
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
Bayanin Amsa
Tambaya 28 Rahoto
A gas occupies 30.0 dm3 at S.T.P. What volume would it occupy at 91oC and 380 mm Hg?
Tambaya 29 Rahoto
Which are the correct IUPAC names for H-CO2CH3 and CH = CH
Tambaya 30 Rahoto
When excess ethanol is heated to 145 oC in the presence of concentrated sulphuric acid, the product is
Tambaya 31 Rahoto
Helium atoms are chemically unreactive because
Tambaya 32 Rahoto
Bronze is an alloy of
Tambaya 33 Rahoto
The reaction 3C(s) + 2Fe2O3(s) = 4Fe(s) + 3CO2(g): \(\Delta\)H =46.0 kJ is
Bayanin Amsa
Tambaya 34 Rahoto
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
Bayanin Amsa
Tambaya 35 Rahoto
On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?
Bayanin Amsa
Tambaya 36 Rahoto
In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathode are:
Anode Cathode
Bayanin Amsa
Tambaya 37 Rahoto
Two metallic ions associated with hard water are
Tambaya 38 Rahoto
How many grams of HBr would exactly be required to react with 2 g of propyne? (C =12, H=1, Br = 80)
Bayanin Amsa
Tambaya 39 Rahoto
Hydrogenation may be effected by
Tambaya 42 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]
Bayanin Amsa
Tambaya 43 Rahoto
the vapour density of a gas may be defined as
Tambaya 44 Rahoto
Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by
Bayanin Amsa
Tambaya 45 Rahoto
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
Bayanin Amsa
Tambaya 47 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 48 Rahoto
When ammonium, potassium and calcium carbonates are each separately heated
Bayanin Amsa
