In Miller's experiment, the closed flask contained :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → CH4, H2, NH3 and H2O
Miller copied the conditions thought to exist on the early earth: a reducing atmosphere with no free oxygen, and electric discharge in place of lightning.
Option (1) C2H6, H2, N2O and NH3 — Incorrect. Ethane and nitrous oxide were not used.
Option (2) CH4, H2, NH3 and H2O — Correct. Amino acids formed in the flask.
Option (3) CH4, O2, NO2 and H2O — Incorrect. Free oxygen was absent from the early atmosphere and from the flask.
Option (4) CO2, H2O, NH3 and O2 — Incorrect. It contains oxygen and no methane or hydrogen.
NCERT Extract:
Origin of Life – “… Miller, an American scientist created similar conditions in a laboratory scale (Figure 6.1). He created electric discharge in a closed flask containing CH4, H2, NH3 and water vapour at 800°C. He observed formation of amino acids.”
