IMSU Chemistry 2019/2020 Model Past Questions

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

An increase in concentration of reactants will increase the reaction rate. This can be explained by:

A.the plumber of effective collisions between the reactant particles
B.the number of effective nuclear screening effect between the reactant particles
C.the number of effective mean free path of the compound in the system
D.the number of crowded substances in the gaseous form

Consider the reaction : N₂O_4(g) (colourless) ↔ 2NO_2(g) (dark brown)
Which one of the following correctly describes what you would see if the pressure was decreased?

A.The gas mixture would become lighter
B.The gases would condense to liquids
C.The gas mixture would become dark brown
D.The gases would separate into two layers

The electronic configuration of the aluminium atom is ____.

A.2, 8, 3
B.1s² 2s² 2p⁶ 3s² 3p¹
C.1s² 2s² 2p⁶ 3s¹
D.2, 8, 2

Which one of the following is not true about chlorine water?

A.It can displace fluorine from a fluoride
B.It is used as a disinfectant
C.It can bleach litmus paper
D.It can displace bromine from a bromide

What is the oxidation number of chromium in Potassium Chromate (K₂CrO₄)

A.+4
B.+6
C.+8
D.-4