A metal M does not liberate hydrogen from dilute acids but reacts with oxygen to give a black colour product. Identify M.
- ANa
- BMg
- CCu
- DCa
Solution & Step-by-step Explanation
Let's analyze the properties given in the question using the metal reactivity series:
Metals located below hydrogen in the activity series (such as Copper, Gold, and Silver) cannot displace hydrogen ions from dilute acidic solutions to release H
2
gas. This rules out highly reactive alkaline metals like Na, Mg, and Ca.
When Copper (Cu) is heated in the presence of atmospheric oxygen, it undergoes oxidation to form a dull black colored product known as copper(II) oxide (CuO):
2Cu+O
2
Δ
2CuO(Black)
Thus, the metal M is copper (Cu).
Metals located below hydrogen in the activity series (such as Copper, Gold, and Silver) cannot displace hydrogen ions from dilute acidic solutions to release H
2
gas. This rules out highly reactive alkaline metals like Na, Mg, and Ca.
When Copper (Cu) is heated in the presence of atmospheric oxygen, it undergoes oxidation to form a dull black colored product known as copper(II) oxide (CuO):
2Cu+O
2
Δ
2CuO(Black)
Thus, the metal M is copper (Cu).