alleryStart learning →In the experiment on rusting, iron nails rust only in the test tube where the nails are exposed to
Adry air alone
Bboth air and water
Cboiled water without air
Dcalcium chloride
Answer & Solution
Correct answer: B. both air and water
1. Tube A (nails in ordinary water, corked) has both air and water — the nails **rust**.
2. Tube B (boiled water + oil layer) has no dissolved air, and Tube C (dry air over CaCl₂) has no moisture — neither rusts.
3. So rusting of iron needs **both air (oxygen) and water** together.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', §3.5_
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