The amount of substance deposited by the passage of 1 A of current for 1s is equal to :

Options

A. Equivalent mass
B. Molecular mass
C. Electrochemical equivalent
D. Specific equivalent

Explanation

To solve the question regarding the amount of substance deposited by the passage of 1 A of current for 1 second, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept**: The amount of substance deposited during electrolysis is related to the charge passed through the electrolyte. This relationship is defined by Faraday's laws of electrolysis.

2. **Using the Formula**: The amount of charge (Q) passed is given by the formula:
\[ Q = I \times T \]
where:
- \( Q \) = charge in coulombs
- \( I \) = current in amperes (A)
- \( T \) = time in seconds (s)

3. **Substituting Values**: In this case, we have:
- \( I = 1 \) A
- \( T = 1 \) s

Therefore, substituting these values into the formula gives:
\[ Q = 1 \, \text{A} \times 1 \, \text{s} = 1 \, \text{C} \]

4. **Relating Charge to Mass**: The mass of the substance deposited (m) can be calculated using the electrochemical equivalent (Z) of the substance:
\[ m = Z \times Q \]
Since we have determined \( Q = 1 \, \text{C} \), we can say:
\[ m = Z \times 1 \, \text{C} = Z \]

5. **Conclusion**: The amount of substance deposited by the passage of 1 A of current for 1 s is equal to the electrochemical equivalent (Z) of the substance.

### Final Answer:
The amount of substance deposited is equal to the electrochemical equivalent (Z).