Q1: Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore ?

ANS:B - High thermal conductivity.

High chemical activity is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore. Slag is a byproduct of the metal extraction process and consists primarily of oxides and other compounds that are separated from the metal during smelting or refining. While some properties of slag, such as high fusibility and fluidity, can be beneficial for facilitating the separation of metal from impurities, high chemical activity can be detrimental. High chemical activity means that the slag is reactive and may interact with other materials or react undesirably with the environment. This can lead to issues such as corrosion of furnace linings or equipment, increased metal losses, or contamination of the final metal product. Therefore, slag with high chemical activity is generally considered undesirable in the context of metal extraction processes.