A 0.5 M solution of urea is isotonic with solution of 10 g non-volatile, non-electrolyte unknown solute X in 100 mL of solution. The molar mass of solute is a) 50 g mol–1 b) 100 g mol–1 c) 150 g mol–1 d) 200 g mol–1
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D. Answer the following questions in one word or sentence
1. Why is it difficult to earmark an exact date in history?
2. Name one source which can help us to know about modern history.
3. What are the events that are usually recorded in history?
4. Name the book written by James Mill?
5. What do official records not tell us?
6. How were records preserved during the British rule?
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