0.1 mol NaCl + 0.1 mol KCl would produce a buffer solution if dissolved in water?
Absolutely not.
You need a weak acid and a salt of the weak acid OR weak base and salt of weak base. KCl and NaCl both are salts of strong acids and strong bases.
To determine if the mixture of 0.1 mol NaCl and 0.1 mol KCl would produce a buffer solution when dissolved in water, we need to consider the components of a buffer solution.
A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid.
In this case, NaCl and KCl are both salts of strong acids and strong bases. They fully dissociate in water to form Na⁺, Cl⁻, K⁺, and Cl⁻ ions.
Since there is no weak acid and its conjugate base, or a weak base and its conjugate acid present in the mixture, the 0.1 mol NaCl + 0.1 mol KCl solution would not produce a buffer solution when dissolved in water. It would simply form a solution containing Na⁺, Cl⁻, K⁺, and Cl⁻ ions.