Q.1.
What substance is oxidized in the following reaction?4Fe + 3O2 --> 2Fe2O3
Q.2.
Determine the oxidation number of chromium in CrO42-.
Q.3.
A decrease in oxidation number.
Q.4.
Substance that oxidizes another substance by accepting its electrons.
Q.5.
In which substance does sulfur have a negative oxidation number?
Q.6.
The oxidation number of Hydrogen in KH potassium hydride equals:
Q.7.
What is the colour change of acidified KMnO4 solution when it is used as an oxidising agent?
Q.8.
An aqueous solution of potassium iodide turns from colourless to brown. What happens to the iodide ions?
Q.9.
Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?
Q.10.
What is the oxidation number of iodine in KIO3?
Q.11.
Reduction is the ___________ of electrons.
Q.12.
An element's oxidation numbers changed from zero to +2 during a reaction. What happened to that element?
Q.13.
If an atom lost electrons, it...
Q.14.
Of the 5 types of reactions, which one(s) are oxidation-reduction?
Q.15.
Which of the following is NOT an example of an oxidation reduction reaction?
Q.16.
Which of the following has an oxidation number of zero on the chlorine atom?
Q.17.
What is the oxidation number on the nitrogen in NO?
Q.18.
What is the oxidation number on the nitrogen in Mg3N2?
Q.19.
What is the oxidation number on the nitrogen in NO2-?
Q.20.
An element's oxidation numbers remain the same during a reaction. What happened to that element?