General Science • ChemistryMedium
Which chemical compound is commonly referred to as 'hypo' and is widely used in photography for fixing photographic negatives?
A. Sodium thiosulfate pentahydrate✓ Correct Answer
B. Sodium chloride
C. Sodium bicarbonate
D. Sodium hydroxide
💡 Solution & Explanation
Sodium thiosulfate pentahydrate is commonly called hypo; it dissolves unexposed silver halides during photographic processing. Common alternatives like sodium chloride represent ordinary table salt, which lacks any such silver-complexing properties. This chemical compound is also utilized as an antidote for cyanide poisoning in medical emergencies.
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