JAMB UTME - Chemistry - 1987
Question 1 Report
The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the saturated solution?
(As = 75, Na = 23, O = 16, H = 1)
Question 2 Report
A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?
Question 3 Report
Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?
Answer Details
both the 2s and 2p orbitals hydrodizes
Question 4 Report
Which of the following elements will form oxide which will dissolve both in dilute HNO3 and NaOH solutions to form salts?
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Question 5 Report
Use the option above to answer this question. The structure of benzoic acid is
Question 6 Report
The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO2(g) + O2(g) ↔ 2SO3(g), ∆H = -196 kJ. What factor would influence increased production of SO3(g)?
Question 7 Report
In the purification of town water supply, alum is used principally to?
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Question 8 Report
The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?
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Question 10 Report
In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?
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Question 11 Report
When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?
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Question 12 Report
Complete oxidation of propan -1- ol gives?
Question 13 Report
If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?
Question 14 Report
Synthetic rubber is made by polymerization of?
Question 15 Report
An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?
Answer Details
Mass number = number of protons + number of neutrons
36 = 17 + X; X = 36 -17 = 19
19 neutrons and 17 protons
Question 16 Report
When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?
Question 17 Report
Use the option above to answer this question. Which is the correct set of results for tests conducted respectively on fresh lime juice and ethanol.
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Question 18 Report
The most volatile fraction obtained from fractional distillation of crude petroleum contains?
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Question 19 Report
| Temp (°C) | 25 | 35 | 45 |
| Time (seconds) | 72 | 36 | 18 |
The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at various temperature are as follows. These results suggest that
Question 20 Report
Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?
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Question 21 Report
If 24.83 cm3 of 0.15 M NaOH is titrated to its end point with 39.45 cm3 of HCl, what is the molarity of the HCl?
Answer Details
NaOH + HCl → NaCl + H2O moles ratio = 1/1
↔ (MaVa) / Mb x 39.45 = 0.094
Question 22 Report
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?
Question 23 Report
Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?
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Question 24 Report
In which of the following pairs of element is allotropy exhibited by each element?
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Question 27 Report
The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?
Question 28 Report
Which of the following gases can best be used for demonstrating the fountain experiment?
I) Nitrogen (ii) Ammonia (iii) Nitrogen (I) oxide
(iv) Hydrogen chloride.
Question 29 Report
The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?
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Question 30 Report
An element Z, contained 90% of 168Z and 10% of Z1818 its relative atomic mass is?
Answer Details
Mass number of Z = 16 while that of Z is 18
90 x 16 = 14.4 10 x 18 = 1.8
100 1 100 1
it relative atomic mass = 14.4 + 1.8 = 162
Question 31 Report
Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?
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Question 33 Report
Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?
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Question 34 Report
The greater the different in electronegativity between bonded atoms, the?
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