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Q.

When iron is exposed to moist air for a long time, it acquires a coating of a brown flaky substance called _____________.

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a

Rancid

b

Must

c

Rust

d

Roast

answer is B.

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Detailed Solution

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  • Iron when exposed to moist air for a long time, is oxidized and acquires a coating of a brown flaky substance called rust. 
  • Rust is the hydrated Ferric oxide with having chemical formula. Fe2O3 .xH2O  where x is the number of water molecules.
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