Let's analyze each item in List I and match it with the appropriate item in List II.

A. $K_{2}C{r}_2{O}_7$: Potassium dichromate is a strong oxidizing agent. In acidic medium, it oxidizes $I^{-}$ to $I_2$. The orange color of dichromate changes to green due to the formation of $C{r}^{3+}$ ions. Therefore, A matches with S. Oxidizing agent.

B. $KMn{O}_4$: Potassium permanganate is also a very strong oxidizing agent. It is used in volumetric analysis as a primary standard for redox titrations. Therefore, B matches with P. Volumetric analysis.

C. $Ti{O}_2$: Titanium dioxide is a white pigment. It is widely used in paints, sunscreens, and cosmetics due to its high refractive index and UV-absorbing properties. Therefore, C matches with Q. White pigment.

D. $AgBr$: Silver bromide is a light-sensitive compound. It is extensively used in photographic films and papers because it undergoes photochemical decomposition when exposed to light, forming silver metal which creates the image. Therefore, D matches with R. Photography.

Based on these matches:

• A - S
• B - P
• C - Q
• D - R

This corresponds to option C.

Correct Answer: (C)