Question

Which of the following pair of metals does not react with oxygen even if they are heated at high temperatures?

• A. Copper$\left(\text{Cu}\right)$ and sodium$\left(\text{Na}\right)$
• B. Silver$\left(\text{Ag}\right)$ and gold$\left(\text{Au}\right)$
• C. Zinc$\left(\text{Zn}\right)$ and copper$\left(\text{Cu}\right)$
• D. Magnesium$\left(\text{Mg}\right)$ and calcium$\left(\text{Ca}\right)$

Answer 1

The correct option is B Silver$\left(\text{Ag}\right)$ and gold$\left(\text{Au}\right)$

Metals like silver $\left(\text{Ag}\right)$ and gold $\left(\text{Au}\right)$ are least reactive. They are called noble or inert metals. Hence, they do not react with oxygen even if they are heated at high temperatures.