The Harappans did not know the use of which of the following elements?

Q. The Harappans did not know the use of which of the following elements?
Answer: Iron
Notes: Iron was not used in the the Harappan cities. Ironworking was introduced to the Indian subcontinent much later, during the late Vedic period (1000–500 BCE) with the onset of the Iron Age in India.

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