BUK Chemistry 2017/2018 Past Questions

Practice each question, then open it to see the full details.

Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the

A.Decrease in nuclear energy
B. Increase in nuclear energy
C. Decrease in screening effect
D. Increase in screening effect

How many unpaired electrons are there in nitrogen sub levels

A.3
B. 2
C. 1
D. 0

The maximum number of electrons in the L shell of an atom

A.2
B. 8
C. 18
D. 32

Elements in the same period in the periodic table have the same

A.Number of shells
B. Chemical properties
C. Physical properties
D.Valence electrons

₁²D + ₁³T ⟶ ₂⁴He + ₀¹n + Energy
The reaction above illustrates

A.Alpha decay
B. Nuclear fusion
C. Nuclear fission
D.Beta decay

What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?

A.0.2g
B. 1.8g
C. 5.4g
D. 14.2g

If a reaction is exothermic and here is a great disorder, it means that

A.The reaction is static
B. The reaction is in a state of equilibrium
C. There will be a large increase in free energy
D. There will be a large decrease in free energy

In the preparation of oxygen by heating KClO₃ in the presence of MnO₂, only moderate heat is needed because the catalyst acts by

A.Lowering the pressure of the reaction
B. Increasing the surface area of the reactant
C. Increasing the rate of the reaction
D. Lowering the energy barrier of the reaction

The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and

A.Trichloromethane
B. Dichloromethane
C. Tetrachloroethane
D. Chloromethane

Which of the following compound is very soluble in water

A.CH₃COOH
B. C₂H₂
C. C₂H₄
D. CH₃COOC₂H₅