Investigating the conditions under which iron rustsलोहे में जंग लगने की परिस्थितियों की जाँच

NCERT Fig 3.13 · interactive diagram

Parts and their functions

• Test tube A — air + water (परखनली A — वायु + जल) — The nail is exposed to both air and water → it rusts.
• Test tube B — boiled distilled water, no air (परखनली B — उबला आसुत जल, वायु नहीं) — Boiling removes dissolved air; the oil layer stops air from dissolving again → no rust.
• Layer of oil (तेल की परत) — Floats on water and keeps air out.
• Test tube C — dry air only (परखनली C — केवल शुष्क वायु) — No moisture → no rust.
• Anhydrous calcium chloride (निर्जल कैल्सियम क्लोराइड) — Absorbs moisture from the air in the tube, keeping it dry.
• Rust (जंग) — A brown flaky substance formed on iron exposed to moist air. Rusting needs BOTH air (oxygen) and water.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 3.13. Report a mistake