Oxidation and Reduction

Q. Which of the following is TRUE?

1. If an element is in its highest possible oxidation state in a compound, the compound can function as an oxidizing agent.
2. If an element is in its intermediate oxidization state in a compound, the compound can function both as an oxidizing agent as well as reducing agent
3. If an electronegative element is in its lowest possible oxidation state in a compound or in free State, it can function as a powerful reducing agent.
4. None of these

Q. A reducing agent is that substance which itself undergoes reduction in a chemical reaction.

1. False
2. True

Q. In compounds formed by the union of different elements, the more electronegative atom will
have negative oxidation state.

1. True
2. False

Q. Which of the following could be considered to be oxidation?

1. $2H{g}^{2+}+2e^{-}\to H{g}_2^{2+}$
2. $Z{n}^{2+}+2e^{-}\to Zn$
3. $F{e}^{2+}\to F{e}^{3+}+e^{-}$
4. $Mn{O}_4^{2-}\to Mn{O}_4^{-}+e^{-}$

Q. Oxidation can involve

1. Addition of oxygen
2. Removal of Hydrogen
3. Removal of electropositive element
4. Addition of electronegative element

Q. Valency and oxidation number of an element is the same number

1. True
2. False

Q. Redox reactions include

1. Oxidation
2. Reduction
3. Transfer of electrons
4. None of these

Q. Which of the following is/are example(s) of reduction?

1. $C{l}_2+2e^{-}\to 2C{l}^{-}$
2. $Mg\to M{g}^{2+}+2e^{-}$
3. $S^{2-}\to S+2e^{-}$
4. $F{e}^{3+}+e^{-}\to F{e}^{2+}$

Q. Which of the following is an oxidising agent in $2Mg+O_2\left(g\right)\to 2MgO\left(s\right)$

1. Mg
2. $O_2$
3. Both Mg and O
4. None of these

Q. Reduction involves

1. Addition of Hydrogen
2. Addition of any electropositive element
3. Removal of oxygen
4. Removal of any electronegative element