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1. The increasing order of density is air < exhaust from chimney < cotton < water < honey < chalk < iron.

2.  Hence, the correct option is C. Gases and liquids behave like fluids.

3. (d) Therefore, the correct sequence of temperature will be 298 K, 311 K and 339 K. On converting 25°C, 38°C and 66°C, to kelvin scale, we get the following temperatures 25°C+ 273 = 298 K 38°C + 273 = 311 K  66°C + 273 = 339 K Therefore, the correct sequence of temperature will be 298 K, 311 K and 339 K.

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