Q. no 17 to 20 are Assertion - Reasoning based questions. These consist of two statements-Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A (b) Both A and R de true and R is not the correct explanation of A (c) A is true but R is false (d) A is False but R is true .Assertion: Iron is used in bridges and automobiles to provide strength. b Reason: A coating of zinc is deposited on iron to protect it from corrosion and formation of rust.which option is correct?

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