Q1: The noble metals

ANS:C - are the lowermost in the electro-chemical series of metals.

"are the lowermost in the electro-chemical series of metals" refers to the position of noble metals in the electrochemical series, also known as the activity series or reactivity series of metals. The electrochemical series is a list of metals (and sometimes non-metals) arranged in order of their reactivity towards oxidation reactions. In this series, metals with higher reactivity, such as alkali metals and alkaline earth metals, are listed towards the top, while metals with lower reactivity are listed towards the bottom. The "lowermost" position in the electrochemical series typically refers to metals that are less reactive or more noble. Noble metals, such as gold, silver, platinum, and palladium, are indeed positioned towards the bottom of the electrochemical series. This indicates that they have a lower tendency to undergo oxidation reactions and are less likely to corrode or react with other substances.