Explanations:The capital city of a state is the administrative center where the main offices of the state government are located. In the context of Tamil Nadu, the capital city is Chennai. Chennai, formerly known as Madras, is not only the capital but also the largest city in Tamil Nadu. It is a significant cultural and economic hub, playing a crucial role in the state's administration and governance.
Chennai is located on the Coromandel Coast off the Bay of Bengal and is known for its rich history, diverse culture, and vibrant economy. The city is home to numerous government buildings, including the Tamil Nadu Secretariat, which houses the offices of the Chief Minister and other state ministers. Additionally, various other government departments and ministries have their headquarters in Chennai, making it the central administrative location for the state.
It is important to note that the capital city of a state is a key geographical and administrative fact that is often tested in various competitive examinations. For Tamil Nadu, Chennai is the correct answer as it is the official capital and the location of the main offices of the state government. Other options such as Kolkata, which is the capital of West Bengal, or Telengana, which is a state in India, are incorrect in this context.