Question

Using the guideline for oxidation numbers, write the oxidation half-reactions for the following:

Example: Na→ Na ^ +1 + 1 e- would be the input for Na → Na+1 + 1e-   

QUESTION 2 Using the guideline for oxidation numbers, write the oxidation half-reactions for the following: Example: Na→ Na ^ +1 + 1e-would be the input for Na → Na+1 + 1 e. c. Be QUESTION 3 Transition metals have five d-orbitals, which contribute to a variety of different possibilities for oxidation. True False

Answer 1

Hi,

Oxidation in a half cell reaction involves the loss of electrons by metals.

Aluminium Al is a 13 group element.

It contains 3 valance electrons and in an electrochemical reaction it donates 3 electrons and becomes Al³⁺

Hence the half cell reaction,

Al ---> Al⁺³ + 3e

Al ---> Al ^ +3 + 3 e

Potassium K is a 1 group element.

It contains 1 valance electrons and in an electrochemical reaction it donates 1 electron and becomes K⁺

Hence the half cell reaction,

K ---> K ^ +1 + 1 e

Beryllium Be is a 2 group element.

It contains 2 valance electrons and in an electrochemical reaction it donates 2 electrons and becomes Be²⁺

Hence the half cell reaction,

Be ----> Be ^ +2 + 2 e

Question 3 ,

Transition metals or d block elements are the elements in which the valance electrons are present in the d orbitals. It contains 5 d orbitals , they are d xy , d xz , d yz , d x²-y² , d z²

Since these d orbitals are of almost similar in energy, the transition metal complexes can be stable in different oxidation states. It exhibits variable oxidation states. Hence the statement is true.

Best Wishes.