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
Note 1: This question is taken from the pre-rationalised NCERT book. The latest edition (2026-27) does not have this part. An extract of the pre-rationalised NCERT book is given below for the benefit of students.
Note 2: Canaries saving miners in an old newspaper report in the book flew straight into this paper. Read the newspaper reports printed in NCERT too.
Pre-rationalised NCERT:
Box: At Singareni, Canaries to miners’ rescue |
