Question map
Not attempted
Correct
Incorrect
★
Bookmarked
Loading…
Q102
(IAS/1995)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry
Answer Verified
The chemical used as a ‘fixer’ in photography is
Result
Your answer:
—
·
Correct:
B
Explanation
In photographic processing the fixer removes unreacted silver halide crystals by forming soluble silver–thiosulfate complexes that can be washed away. Common thiosulfate salts used as fixers are sodium thiosulfate (historically called “hypo”) and ammonium thiosulfate; sodium thiosulfate is widely cited as the traditional photographic fixer and is effective at dissolving remaining silver halides to prevent further darkening or fogging of the image [1]. Sources describing fixation chemistry and common fixer salts explicitly list sodium thiosulfate as a primary fixer used for film and paper, confirming option 2 as correct [1].
Sources
- [1] https://en.wikipedia.org/wiki/Photographic_fixer
How others answered
Each bar shows the % of students who chose that option.
Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
50%
got it right
✓ Thank you! We'll review this.