2019 - JAMB Chemistry Past Questions and Answers - page 2
Which of the following metals is the most essential in the regulation of blood volume, blood pressure and osmotic equilibrium?
Which of the following alkaline metals react more quickly spontaneously with water?
When chlorine water is exposed to bright sunlight, the following products are formed
HCl\(_{(aq)}\) and Cl\(_2\)
HOCl\(_{(aq)}\) and Cl\(_2\)
HCl\(_{(aq)}\) and O\(_2\)
HOCl\(_{(aq)}\) and O\(_2\)
By exposing chlorine water to sunlight, it decomposes into HCl gas and oxygen. When chlorine water is exposed to strong sunlight it produces an odourless and colourless gas called oxygen.
Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?
chlorine attacks the starch to give the blue-black color
chlorine attacks the iodide ion to give the blue-black color
chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color
iodine attacks the starch to give the blue-black color
The oxidization of iodide (by chlorine) ion produces the iodine which attacks the starch to give the blue-black colour
Which of the following is a set of neutral oxides?
N\(_2\)O, H\(_2\)O, CO
N\(_2\)O, SO\(_2\), CO
N\(_2\)O, Na\(_2\)O, ZnO
N\(_2\)O, SO\(_3\), NO
Neutral oxides show neither basic nor acidic properties. As a result of this behaviour neutral oxides do not form salts when reacted with acids or bases, e.g., carbon monoxide (CO); nitrous oxide (N2O); nitric oxide (NO), etc., are neutral oxides
SO\(_3\) is not directly dissolved in water in the industrial preparation of H\(_2\)SO\(_4\) by the contact process because
Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region
which contains protons and neutrons
which is positively charged
which is massive and can cause deflection of a few projectiles
which is very large and in which close to 98% of projectiles pass undeflected
Rutherford's account of Nuclear theory does not take into account the fact that atoms contain a massive region and cause deflection of from projectiles. He concluded that all of the positive charge and the majority of the mass of the atom must be concentrated in a very small space in the atom's interior, which he called the nucleus. The nucleus is the tiny, dense, central core of the atom and is composed of protons and neutrons
Elements X and Y have electronic configurations 1s\(^2\)2s\(^2\)2p\(^4\) and 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^1\) respectively. When they combine, the formula of the compound formed is
By what amount must the temperature of 200cm\(^3\) of Nitrogen at 27°C be increased to double the pressure if the final volume is 150cm\(^3\) (Assume ideality)
The combustion of carbon(ii)oxide in oxygen can be represented by equation.
2CO + O\(_2\) → 2CO\(_2\)
Calculate the volume of the resulting mixture at the end of the reaction if 50cm\(_3\) of carbon(ii)oxide was exploded in 100cm\(_3\) of oxygen