Which of the following is used in photography?

Correct option is B

The correct answer is (B) Sodium thiosulphate.

• Sodium thiosulphate is commonly used in photography as a fixing agent. It is used in the traditional photographic process to remove unexposed silver halide crystals from photographic film and paper, ensuring that the image remains stable.

Information Booster:

• In photographic processing, Sodium thiosulphate is known as the hypo solution, which is crucial in the fixing process that helps the image to stay intact and prevents further exposure to light.

Additional Information:

• Sodium bicarbonate (Option A) is used in baking and cleaning, but not in photography.

• Sodium hydroxide (Option C) is a strong base used in cleaning, but is not used directly in photography.

• Sodium sulphate (Option D) is primarily used in detergents and other industrial applications, not in photography.