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Arrange the following solutions in order of their increasing boiling points. (i) 10 –4 M NaCl (ii) 10 –4 M Urea (iii) 10 –3 M NaCl (iv) 10 –2 M NaCl

1. (ii) < (i) < (iii) < (iv)
2. (ii) < (i) ≅ (iii) < (iv)
3. (i) < (ii) < (iii) < (iv)
4. (iv) < (iii) < (i) < (ii)

Correct answer: (ii) < (i) < (iii) < (iv)

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