Keerti added dilute Hydrochloric acid to four metals and recorded her observations as shown in the table given below:
| Metal | Gas Evolved |
| Copper | Yes |
| Iron | Yes |
| Magnesium | No |
| Zinc | Yes |
Select the correct observation(s) and give chemical equation(s) of the reaction involved.
Answer:
- H 2 gas is evolved on the addition of Hydrochloric Acid to metal when the metal displaces the H-atom in HCl to form metal chloride.
- This occurs only when the metal is more reactive than Hydrogen (check reactivity series ).
- The reaction is known as displacement reaction .
|
K |
P |
Please |
|
Na |
S |
Send |
|
Ba |
B |
Berries |
|
Ca |
C |
Carrots |
|
Mg |
M |
Mangoes |
|
Al |
A |
All |
|
Zn |
Z |
Zipped |
|
Fe |
I |
I |
|
Ni |
N |
N |
|
Sn |
T |
The |
|
Pb |
L |
Large |
|
H |
H |
Handbag |
|
Cu |
C |
Charlie |
|
Hg |
M |
M |
|
Ag |
S |
S |
|
Au |
G |
G-ed |
|
Pt |
P |
Paul |
From the reactivity series we can say that
- All given metals except Copper are more reactive than Hydrogen and thus able to form H 2 gas on reaction with HCl.
- Therefore, the correct options from the table are : Zinc (Zn) and Iron (Fe) .
- The required chemical Reactions are:
Fe + HCl → FeCl₂/ FeCl₃ + H₂
Zn + HCl → ZnCl₂ + H₂
