Question

Hypo is used:

• A. in developing photographic films
• B. for making printing inks
• C. for making perfumes
• D. as bleaching agent

Answer 1

Answer: (A)

Hypo $\text{(N}{\text{a}}_2{\text{S}}_2{\text{O}}_3\text{.5}{\text{H}}_2\text{O)}$ or sodium thiosulphate is used for fixing negative by complex formation.