OAU Chemistry 2015/2016 Past Questions

A physical change is exemplified by the

The number of neutrons in the deuterium atom is/are

Which of these does not affect the rate of a particular chemical reaction?

The type of reaction an alkanoic acid cannot undergo is

Which of the followings will change the equilibrium constant of the reaction CO(g) + H₂O(l) → CO₂(g) + H₂(g)?

In the electrolysis of acidified water using platinum electrodes, 1dm⊃3 of oxygen was collected at s.t.p. by passing 4.5 amperes into the electrolytic cell. Calculate the time required to set this amount of gas free. [molar volume of gas at s.t.p. = 22.4dm^3, 1 Faraday = 9650 coloumbs]

Two plugs of glass wool soaked in concentrated ammonia and concentrated hydrochloric acid are placed at the opposite ends of a long tube such that the distance between them is 100cm^3. The ratio of the distance covered by ammonia to that covered by hydrochloric acid when a white smoke is first noticed is

The complete oxidation of propan - 1 - ol yields

Which of the following is responsible for the conduction of electricity in a gas enclosed in a glass tube containing two electrodes at a reduced pressure and to which a high voltage is applied?

Which of these is correct about methyl orange?

Which of the following ions will interact with water to give a solution of pH < 7?

M(s) + xH2SO4(aq) ⟶ M(SO4)x(aq) + xH2(g) Which of the following elements will not undergo the above reaction?

An ideal gas changing volume as temperature rises can be represented by the diagram below:
The point marked X on the graph is

150cm³ of nitrogen II oxide were sparked with 100cm³ of oxygen, what volume of nitrogen IV oxide will be produced at s.t.p.?

What is the pH of 2.5 x 10^-3moldm^-3 barium hydroxide solution?

When CuSO₄ solution is treated with ammonia solution drop by drop till it is added in excess, a precipitate is first formed which then dissolves in excess to give a deep blue solution. The deep blue solution is

Which of these elements has the highest first ionization energy?

The name of CH₃-O-COC₂H₅ is,

How many isomeric dichlorobenzenes are obtainable?

By accurate description, ozone in the reaction, O₃(g) + H₂O₂(l) -----> H₂O(l) + 2O₂(g) is

If 7.0g of ethene at s.t.p. occupy 5.6dm³ what volume will 7.5g of ethane at the same condition occupy? [C = 12; H = 1; GMV at s.t.p. = 22.4dm³]

Which of the alcohols below is likely to be oxidized to give the acid,
$\table CH_3, -, C, -, H, -, COOH; , , ∣, , , , , ; , , CH_3, , , , , ;$