Question

3. Magnesium. aluminium, zinc and iron were put in different test tubes containing dilute
hydrochloric acid. In which test tube will the rate of formation of bubbles of hydrogen gas be
fastest and why?​

Answer 1

Explanation:

Answer:-

Given:-

• Magnesium. aluminium, zinc and iron were put in different test tubes containing dilute hydrochloric acid.

To find:-

The fastest rate of reactivity of the following metals.

Let's Learn!

Do you reckon the reactivity series? A brief note here :-

1. K Pottasiun
2. Na Sodium
3. Ca Calcium
4. Mg Magnesium
5. Al Alumunium
6. Zn Zinc
7. Fe Iron
8. Sn Tin
9. Pb Lead
10. H Hydrogen
11. Cu Copper
12. Au Silver
13. Ag Gold
14. Pt Platinum

Now, if we move according to the table, the highest reacting metal is Magnesium.

So, Formation of bubbles is fast because it is highly reactive and also, produces bubbles of Hydrogen.

Remember:-

Magnesium does not react with cold water but with hot water, it reacts.

$.$

Answer 2

Answer:

In the test tube having Magnesium (Mg) the rate of formation of bubbles of hydrogen gas is fastest because it is more reactive than the other three.

Explanation:

• Metals and acids react to form their corresponding salts and hydrogen gas.
• The reaction is as follows:-

Metals+ dilute.HCl⇒Salt of metal+Hydrogen(H₂)

• The reactivity of metals determines how vigorous a reaction will be.
• The other three metals are less reactive than magnesium (Mg).
• Therefore, the reaction's vigor differs as a result of the change in reactivity.

However, the order is as follows:-

Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe)

So, in the test tube having Magnesium (Mg) the rate of formation of bubbles of hydrogen gas is fastest because it is more reactive than the other three.

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