Question

The least reactive with oxygen in the list is:

a. Iron
b. zinc
C. copper
d. lead

Answer 1

The least reactive with oxygen in the list is C. copper

• In order to determine the reactivity of any element we always look at the reactivity series.
• In this series all the metals are arranged in descending order from top to bottom. The metal which occupies the highest position is most reactive of all while the one on bottom is least reactive.
• Since, Zinc, Iron and Lead are found on the top part of reactivity series so they will react with oxygen easily.
• Among the following Copper lies at the bottom hence, it will be the least reactive of all.

Answer 2

The least reactive metal with oxygen in the list is C. Copper

Explanation:

• In salt solution, a more reactive metal dismisses a less reactive metal. Displacement reactions are the name for these types of reactions.
• Consider how zinc is displaced from copper sulphate when a little amount of zinc is immersed in a copper sulphate solution. Copper sulphate's blue colour disappears, leaving a colourless zinc sulphate solution. As a result, zinc has higher reactivity than copper.
• Zinc is a metal that displaces copper and iron from solutions. Zinc is more reactive than copper and iron. Copper does displace from its solution by iron. As a result, copper has a lower reactivity than iron. Copper is the least reactive metal since it does not displace any other metal.