Correct Option
Statement 1 is correct. Sodium sulphate functions as an inert filler in detergent powders. Its primary role is to absorb moisture, thereby preventing the powder from caking or clumping. This ensures the detergent remains free-flowing and easy to dispense and use.
Statement 2 is correct. Sodium silicate contributes to maintaining the alkalinity of the detergent solution. This alkaline environment is essential for effective grease and dirt removal, as it aids in the saponification of fats and emulsification of oils. Furthermore, sodium silicate acts as a corrosion inhibitor, protecting washing machine components.
Since both statements accurately describe the purposes of these additives, option (C) is the correct answer.
Incorrect Options
Options (A) and (B) are incorrect because they only acknowledge one of the two correct statements. Both sodium sulphate and sodium silicate perform essential functions in detergent formulations.
Option (D) is incorrect as both additives serve distinct and functional purposes, contributing to the overall efficacy and stability of the washing powder.