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The question consists of two statements, an assertion and a reason. The student must determine whether each statement is true and then whether the reason holds true to the assertion.  Assertion- A. Over a period of time rust accumulates on iron. Reason- R. When iron is exposed to oxygen and moisture for a length of time, it forms rust.

The question consists of two statements, an assertion and a reason. The student must determine whether each statement is true and then whether the reason holds true to the assertion.  Assertion- A. Over a period of time rust accumulates on iron. Reason- R. When iron is exposed to oxygen and moisture for a length of time, it forms rust. Correct Answer Both A and R are true and R is correct explanation of A.

Rust appears on iron as it reacts with the oxygen and moisture present in the atmosphere over a period of time. Hence, only option 1 is true.

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