Which of the following metals cannot displace hydrogen from dilute hydrochloric acid?
Answer
Copper
The correct answer is Copper — Hence the correct option is D. Copper.
Step-by-step solution
- Recall the reactivity series: metals above hydrogen displace it; metals below do not.
- Magnesium, zinc and iron lie above hydrogen, so they can displace it.
- Copper lies below hydrogen in the series; it cannot displace hydrogen from acids.
- Hence the correct option is D. Copper.
Common mistake: Assuming iron can displace hydrogen
Concept tested: Displacement reaction series
Published · How this solution was prepared and checked
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