तैरता हुआ जलने लगेगा
General competitive examinations frequently test candidates on Current Affairs topics. Questions like "सोडियम के टुकड़े को यदि पानी में डाला जाय तो वह-..." are designed to verify factual recall and general awareness. Regular practice on similar MCQs ensures a higher accuracy rate. The correct option here is तैरता हुआ जलने लगेगा.