What was the weight and composition of Iltutmish's Tanka?

It was a high-purity silver coin weighing approximately 175 grains (about 11.5 grams).

Iltutmish and the Silver Tanka | Medieval Indian Coinage (2013 PYQ)

ID: ART_MIS_2013_37 Ref: Medieval India: From Sultanat to the Mughals by Satish Chandra

Who was the medieval king responsible for introducing the silver coin called 'Tanka' in North India?

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Correct Option: A

Sultan Iltutmish introduced the silver Tanka in North India. Along with the copper Jital, it formed the basis of the Delhi Sultanate's currency system.