$\rho H$ of water is 7.0 at 298 K. If water is heated to 350 K, which of the following should be true?

Question

(a) $\rho OH$ will decrease

(b) $\rho OH$ will increase

(c) $\rho OH$ will remain seven

(d) Concentration of $H^+$ ions will increase but that of $OH^-$ will decrease.