The largest brackish water lake in India is
(A) Wular Lake
(B) Sambhar Lake
 (C) Kabar Lake
(D) Chilka Lake

Hint: There are three types of lakes: brackish, salt and freshwater lakes. Brackish Lake contains salty water. But the concentration of salts is lower than in the ocean. The salt percentage is less than 3%. Freshwater Lake has a very low percentage of salts i.e. less than 1 or 0.5%. Whereas salt Lakes have more than 3% salt concentration.

Complete answer:
Fresh water contains a salt percentage of less than 1 or 0.5%. Brackish water contains a salt percentage of less than 3%. Salt lake contains a percentage of more than 3%.
Wular Lake is the largest fresh water lake in Asia. It is situated in Jammu and Kashmir which is located in India. That’s why “Wular Lake” is the incorrect option.
Sambhar Lake is the largest salt lake of India. It is situated in Rajasthan. That’s why “Sambhar Lake” is the incorrect option.
Kabar Lake is the freshwater lake. It is located in Bihar in India. That’s why “kabara Lake'' is the incorrect option.
Chilka is the largest brackish water lake in India. It is located at the south of mouth of Mahanadi River in Orissa. It was a part of Bay of Bengal in ancient times. Then it was silted by monsoon tides and separated from the Bay of Bengal. It is the site for migratory birds and dolphins are also found there.

That’s why the correct answer is “Chilka Lake”.

Note:
Chilka Lake is the brackish lake because salt concentration is less than 3%. Kabar and Wular are freshwater lakes because salt concentration is less than 0.5 or 1%. Whereas Sambhar is the salt lake because salt concentration is more than 3%.