प्रदूषित जल या भूजल में, नाइट्रोजन आमतौर पर किस स्थिर अकार्बनिक रूप में पाई जाती है?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?