Question

question 1
the generic double displacement reactions is ab + cd ---> ad + cb
the a and the c are cations. the b and d are anions
the reaction will never form ---> ac + bd
why not?
not true. it can happen.
cations will not combine with another cation.
i think of another fake answer so you know this isnt it.

Explanation:

In double displacement reactions, ions exchange partners. Cations (A, C) are positively charged, and anions (B, D) are negatively charged. Compounds are formed by electrostatic attraction between opposite charges. So, a cation (A or C) must pair with an anion (B or D), not another cation. Forming AC would mean two cations (A and C) combining, which is impossible due to like - charge repulsion and the nature of ionic bonding (needing opposite charges). The first option is wrong as the reaction can't form AC + BD, and the third is a distractor.

Answer:

B. Cations will not combine with another cation.