JAMB UTME - Chemistry - 1987
Tambaya 2 Rahoto
The most volatile fraction obtained from fractional distillation of crude petroleum contains?
Bayanin Amsa
Tambaya 3 Rahoto
Alloys are best prepared by?
Tambaya 4 Rahoto
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?
Bayanin Amsa
Tambaya 5 Rahoto
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?
Tambaya 6 Rahoto
Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?
Bayanin Amsa
Tambaya 7 Rahoto
Complete oxidation of propan -1- ol gives?
Tambaya 8 Rahoto
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)?
Tambaya 9 Rahoto
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?
Tambaya 10 Rahoto
An element Z, contained 90% of 168Z and 10% of Z1818 its relative atomic mass is?
Bayanin Amsa
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
Tambaya 11 Rahoto
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?
Tambaya 12 Rahoto
In which of the following pairs of element is allotropy exhibited by each element?
Tambaya 13 Rahoto
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.
Bayanin Amsa
Tambaya 14 Rahoto
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)
Tambaya 15 Rahoto
In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?
Bayanin Amsa
Tambaya 16 Rahoto
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.
Tambaya 17 Rahoto
The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?
Tambaya 18 Rahoto
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?
Tambaya 19 Rahoto
In the purification of town water supply, alum is used principally to?
Bayanin Amsa
Tambaya 21 Rahoto
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?
Tambaya 22 Rahoto
When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?
Tambaya 24 Rahoto
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?
Bayanin Amsa
Mass number = number of protons + number of neutrons
36 = 17 + X; X = 36 -17 = 19
19 neutrons and 17 protons
Tambaya 25 Rahoto
The greater the different in electronegativity between bonded atoms, the?
Bayanin Amsa
Tambaya 26 Rahoto
Which of the following elements will form oxide which will dissolve both in dilute HNO3 and NaOH solutions to form salts?
Tambaya 27 Rahoto
Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?
Bayanin Amsa
both the 2s and 2p orbitals hydrodizes
Tambaya 28 Rahoto
| 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
Tambaya 29 Rahoto
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?
Bayanin Amsa
NaOH + HCl → NaCl + H2O moles ratio = 1/1
↔ (MaVa) / Mb x 39.45 = 0.094
Tambaya 30 Rahoto
Use the option above to answer this question. The structure of benzoic acid is
Tambaya 31 Rahoto
Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?
Bayanin Amsa
Tambaya 32 Rahoto
Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?
Bayanin Amsa
Tambaya 34 Rahoto
Synthetic rubber is made by polymerization of?
