Question

Which of the following is incorrect with respect to metals?

• A. If one of the metals is mercury, then the alloy is known as an amalgam.
• B. The metals high up in the reactivity series are very reactive.
• C. Metals above hydrogen in the activity series cannot displace hydrogen from dilute acids.
• D. Metals reacts with dilute acid to form its salt and hydrogen gas.

Answer 1

The correct option is C

Metals above hydrogen in the activity series cannot displace hydrogen from dilute acids.

• Alloys that contain mercury are known as amalgams.
• The metals high up in the reactivity series are very reactive.
• More reactive metals can replace less reactive metals.
• Metals which are above hydrogen in the reactivity series will displace hydrogen from dilute acids.

For example: $\text{Fe}\text{(s)}+{\text{CuSO}}_4\text{(aq)}\to {\text{FeSO}}_4\text{(aq)}+\text{Cu}\text{(s)}$

Here, iron is more reactive than copper. So, it displaces copper from its solution.