Consider the following statements about thermal conductivity: 1) Thermal conductivity decreases with increasing molecular weight 2) Thermal conductivity of non-metallic liquids generally decreases with increasing temperature 3) Thermal conductivity of gases and liquids is generally smaller than that of solids Which of the above statements are correct?

Consider the following statements about thermal conductivity: 1) Thermal conductivity decreases with increasing molecular weight 2) Thermal conductivity of non-metallic liquids generally decreases with increasing temperature 3) Thermal conductivity of gases and liquids is generally smaller than that of solids Which of the above statements are correct? Correct Answer 1, 2 and 3

Explanation:

Thermal conductivity of gases is inversely proportional to molecular weight. Thus, thermal conductivity decreases with increasing molecular weight.

The thermal conductivity of non-metallic liquids generally decreases with increasing temperature, the notable exceptions is being glycerin and water. Thermal conductivity of non-metallic liquids decreases with increasing molecular weight.

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The thermal conductivity of gases and liquids is generally smaller than that of solids.