कौन सा अवलोकन किसी रासायनिक परिवर्तन का सबसे मजबूत प्रत्यक्ष प्रमाण हो सकता है?
Which observation may provide the strongest direct evidence of a chemical change?
Explanation opens after your attempt
C. दो विलयनों को मिलाने पर स्थायी अवक्षेप बनाA permanent precipitate formed when two solutions were mixed
Concept
Formation of a new solid precipitate can be direct evidence of a new substance. In exams identify clear evidence of change.
Why this answer is correct
The correct answer is C. दो विलयनों को मिलाने पर स्थायी अवक्षेप बना / A permanent precipitate formed when two solutions were mixed. Formation of a new solid precipitate can be direct evidence of a new substance. In exams identify clear evidence of change.
Exam Tip
नए ठोस अवक्षेप का बनना नए पदार्थ के बनने का प्रत्यक्ष संकेत हो सकता है। परीक्षा में स्पष्ट परिवर्तनकारी प्रमाण पहचानें।
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