The canary bird is used to detect ______ gas in the Singareni coal fields.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Carbon-Monoxide
The canary bird was historically used in the Singareni coal fields, to detect the presence of carbon monoxide (CO) — a colorless, odorless, and toxic gas. Canaries are highly sensitive to carbon monoxide. If they showed signs of distress or died, it warned miners of the presence of the gas, allowing them to evacuate in time.
Note: This question is from pre rationailsed NCERT.