Let’s evaluate each pair:

1. Kamaraj Port : First major port in India registered as a company This is correct. Kamaraj Port, formerly known as Ennore Port, was the first major port in India to be registered as a company under the Companies Act, 1956.
2. Mundra Port : Largest privately owned port in India This is correct. Mundra Port, located in Gujarat, is the largest privately owned port in India, operated by Adani Ports and SEZ Limited.
3. Visakhapatnam Port : Largest container port in India This is incorrect. The largest container port in India is Jawaharlal Nehru Port (Nhava Sheva) near Mumbai, not Visakhapatnam Port.

Based on the evaluation, two of the pairs are correctly matched. The correct answer is: Only two pairs