Correct Answer: Bleaching powder

Solution : The correct answer is Bleaching powder.

CaOCl ₂ is the chemical formula for bleaching powder, also known as calcium oxychloride or calcium hypochlorite. It's made from dry slaked lime and chlorine gas. It is a white solid, yet commercial samples appear yellow. It is a powerful oxidizing substance that is used to bleach soiled garments.
This product is frequently used in the textile industry's linen and cotton cloths. Other applications for bleaching powder include: It is commonly used to disinfect and make drinking water safe. Bleaching powder is used by paper makers to bleach wood pulp. Wool can become unshrinkable when bleached.