Which of these metals CANNOT replace hydrogen from alkaline solutions?

Som15432

1 year ago

The correct option is D. Iron.
This is because;
* Aluminium, Zinc, and Tin are all amphoteric metals. This means they can react with both acids and bases (like alkaline solutions). When they react with alkaline solutions, they can displace hydrogen gas.
* Iron, on the other hand, is not amphoteric. It primarily reacts with acids, not alkaline solutions, and therefore does not displace hydrogen from them.
So, the answer is D. Iron.

MustaphaAremu

4 years ago

But iron comes before tin in the ecs

Uwamgbede21

1 year ago

The answer is Tin

Refhord

3 years ago

D is the answer because iron is not an amphoteric oxide

Jeremiah0.0000000000000000001

10 months ago

the answer is Aluminium because Al does nit react with NAOH due go the formation of a protective film of Oxide
that is exactly why NAOH is transported in Aluminium containers

Velapearl

2 months ago

Step 2a: Recall the reactivity series for JAMB purposes
From most reactive to less reactive:
Potassium, Sodium, Calcium, Magnesium, Aluminum, Zinc, Iron, Tin, Lead, Copper, Silver, Gold
Hydrogen sits roughly here in the series between iron and tin. Metals above hydrogen can displace hydrogen from acids or alkaline solutions. Metals below hydrogen cannot.
Step 2b: Analyze the options
Aluminum: aluminum is highly reactive. It can react with both acids and hot alkaline solutions. It forms hydrogen gas. ✅
Zinc: zinc is moderately reactive. It reacts with acids and hot alkalis to produce hydrogen gas. ✅
Tin: tin is much less reactive. It cannot displace hydrogen from acids or alkaline solutions easily. ❌
Iron: iron is reactive enough to react with acids and with hot concentrated alkali solutions under some conditions. ✅
So the metal that cannot displace hydrogen from alkaline solutions is tin.
Correct answer: C) tin
Step 3: Why the other options are wrong
Aluminum reacts with NaOH because it is very reactive. Even though it forms a protective oxide layer, hot NaOH dissolves the oxide, allowing the reaction to go on.
Zinc reacts with NaOH to give zincate and hydrogen. This is a classic JAMB reaction that comes up every year.
Iron is lower than aluminum and zinc, but it is still reactive enough to produce hydrogen when the alkali is hot and concentrated. In JAMB, they accept iron as reactive enough in these scenarios.
Tin is very low on the reactivity series. It is almost inert toward alkaline solutions, so hydrogen is not displaced. That’s why tin is the answer.