Combine the following into a single homework question, asking for identification of correct answers to multiple choice questions related to chemistry concepts.

Voici les réponses aux questions :

12. Identify the pair of s-block elements that show diagonal relationship.

• C) Li/Mg

13. What are isomers?

• C) Compounds with same molecular formula but different structural formulae

14. Catenation as applied to carbon Chemistry is the ability for carbon to

• D) form strong bonds with itself

15. The ground state electronic configuration of nitrogen with atomic number 7 using s p d f notation is:

• C) $1s^2 2s^2 2p^3$

16. A cell is constructed using the following two half cells:
$\text{Ni}^{2+}(\text{aq}) + 2\text{e}^- \to \text{Ni}(\text{s})$; $\text{E}^\circ = -0.25\text{V}$
$\text{Ag}^{+}(\text{aq}) + \text{e}^- \to \text{Ag}(\text{s})$; $\text{E}^\circ = +0.80\text{V}$
Choose the correct cell diagram of the cell.

• A) $\text{Ni}(\text{s}) / \text{Ni}^{2+}(\text{aq}) // \text{Ag}^{+}(\text{aq}) / \text{Ag}(\text{s})$

17. The overall reaction $(\text{CH}_3)_2\text{CHBr} + \text{KOH} \to (\text{CH}_3)_2\text{CHOH} + \text{KBr}$ is best described as

• C) Nucleophilic Substitution