Question

Which of the following ore contains two metals which show diagonal relationship?

• A. Na and Mg
• B. Li and Mg
• C. Li and Na
• D. Al and C

Answer 1

The correct option is B

Li and Mg

Explanation for correct option

(B) $\mathrm{Li}$ and $\mathrm{Mg}$

Diagonal relationship

• The diagonal Relationship of the element refers to the pairs of diagonally adjacent elements in the second and third periods of the periodic tables.
• In the second and third periods of the periodic table, the diagonal relationship might occur between specific pairs of diagonally neighboring elements between two metals, and this is the case here $\mathrm{Li}$ and $\mathrm{Mg}$ are present diagonally and they can form a diagonal relationship.

Explanation for incorrect options

• $\mathrm{Na}$ and $\mathrm{Mg}$:-$\mathrm{Na}$ and $\mathrm{Mg}$ are not present diagonally, they are present adjacent to each other in the periodic table, so they cannot form a diagonal relationship.
• $\mathrm{Li}$ and $\mathrm{Na}$:-$\mathrm{Li}$ is present in the 2nd period and $\mathrm{Na}$ is present in the 3rd period of the periodic table, but they are not present diagonally so they cannot form a diagonal relationship.
• $\mathrm{Al}$ and $\mathrm{C}$:-$\mathrm{Al}$ cannot form a diagonal relationship with $\mathrm{C}$ rather it can form a diagonal relationship with $\mathrm{Be}$.
• Hence, options (A), (C), and (D) are incorrect.

Hence, option (B) is correct. $\mathrm{Li}$ and $\mathrm{Mg}$ show a diagonal relationship.