Corrosion: assertion and reason and choose the correct answer

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Assertion (A)	When iron is exposed to air for an extended period of time, it forms a rusty coating.
Reason (R)	This is due to iron's reactivity with dry air.

Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Both A and R are false.

II.

Bottles A, B, and C contain water + air, water and dry air, respectively. You keep the key in each bottle. An iron key is kept in each bottle. What will happen if you wait a while?

The key in bottle A is rusted, but not in bottle B or C.
The key in bottle C is rusted, but not in A or B.
The key in bottle B is rusted, but not in A or C.
Both bottles A and C are rusted.

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24. Corrosion: assertion and reason and choose the correct answer

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