JAMB UTME - Chemistry - 1986
Tambaya 2 Rahoto
In the electrolysis of aqueous solution of K2SO 4 in the above cell, which species migrate to the anode?
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Tambaya 3 Rahoto
A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?
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Tambaya 4 Rahoto
Which of the following salts when dissolved in water will NOT give the corresponding pH value?
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Tambaya 5 Rahoto
What mass of a divalent metal M (atomic mass = 40) would react with excess hydrogen gas measured at S.T.P?
Tambaya 6 Rahoto
Which of the following is NOT correct test for the named organic compound in each case?
Tambaya 8 Rahoto
The general formula of an alkyl halide (where X represents the halide) is?
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Tambaya 9 Rahoto
Which of the following will react further with oxygen to form higher oxide?
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Tambaya 10 Rahoto
In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?
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Tambaya 12 Rahoto
Which of the following does NOT contain aluminium as component?
Tambaya 13 Rahoto
Which of the following metals does NOT form a stable trioxocarbonate (IV)?
Tambaya 14 Rahoto
How much of magnesium is required to react with 260cm3 of 0.5 M HCl? [Mg = 24]
Tambaya 15 Rahoto
10cm3 of hydrogen fluoride gas react with 5cm3 of dinitrogen difluoride gas (N2F2) to form 103 of a single gas. Which of the following is the most likely equation of the reaction?
Tambaya 16 Rahoto
When steam is passed through red hot carbon, which of the following are produced?
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Tambaya 17 Rahoto
Which of the following sulphides is insoluble in dilute HCl?
Tambaya 18 Rahoto
Which of the following compounds is NOT formed by the action of chlorine on methane?
Tambaya 19 Rahoto
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?
Tambaya 20 Rahoto
What are the values of x, y and z respectively in the equation: xCu + yHNO3 ? xCu(NO3)2 + 4H2O + zNO?
Tambaya 22 Rahoto
What reaction takes place when palm-oil is added to potash and foam are observed?
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Tambaya 23 Rahoto
A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?
Tambaya 24 Rahoto
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?
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Tambaya 25 Rahoto
Which of the following solutions will conduct the least amount of electricity?
Tambaya 27 Rahoto
The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?
Tambaya 28 Rahoto
Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?
Tambaya 29 Rahoto
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?
Tambaya 30 Rahoto
The approximate volume of air containing 10cm3 of oxygen is?
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Volume of air containing 10 cm O2 is
(100 x 10)/(20) = 50cm3
Tambaya 31 Rahoto
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?
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Tambaya 32 Rahoto
When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?
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Tambaya 33 Rahoto
The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation
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The relationship between (U) of a gas molecule and the relative molecular mass is ¯U = (km )12
or ¯U = √km
Tambaya 34 Rahoto
In the solubility curve above, water at 98oC is saturated with KCL and KCIO3 What is the percentage of KCL impurity in the crystals formed when the solution is cooled to 30 oC?
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Tambaya 35 Rahoto
Ammonia gas is normally dried with?
Tambaya 36 Rahoto
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
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Tambaya 38 Rahoto
Which of the following groups of physical properties increases from left to right of the periodic table? i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electro affinity
Tambaya 39 Rahoto
The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 1023]
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The number of atoms of chloride present in 5.85g of NaCl is 5.85 x 6.0 x 1023
= 6.02 x 1022
Tambaya 42 Rahoto
When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
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Tambaya 43 Rahoto
The tabulated results below were obtained by titration 10.0 cm3 of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is
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The ratio of permanent to temporary hardness will be 20:(20 - 15)
= 20:5
= 4:1
Tambaya 44 Rahoto
The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
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Tambaya 45 Rahoto
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
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NH4OH = 20cm of 0.1 m
NH4 + HCl → NH4Cl = H2O
Heat of Neutralization of NH4OH
= −1022
= -51.0 KJ mole-1
Tambaya 46 Rahoto
Which of the following is used as an 'anti-knock' in automobile engines?
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Tambaya 47 Rahoto
Oxygen-demanding waste are considered to be a water pollutant because they?
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