ANS:B - decreases

thermal conductivities of most liquids decrease with a rise in temperature" is generally incorrect. In most cases, thermal conductivities of liquids tend to increase with increasing temperature. When temperature rises, the kinetic energy of molecules in the liquid increases. This increased molecular motion enhances the transfer of thermal energy, resulting in higher thermal conductivities. However, there might be exceptions for certain liquids, especially those undergoing phase changes or exhibiting anomalous behavior at specific temperature ranges. In these cases, thermal conductivities might not follow a simple trend of increasing with temperature. Yet, it's important to note that such exceptions are not typical for most liquids. Therefore, the statement "thermal conductivities of most liquids decrease with a rise in temperature" does not accurately represent the usual behavior observed in liquids.