The quantity of silver deposited when one coulomb charge is passed through AgNO3 solution:

Strategy: Faraday's First Law of Electrolysis states that the mass of substan\ce deposited ($m$) is proportional to the quantity of electricity passed ($Q$). The proportionality constant is the Electrochemical Equivalent ($Z$).

Step 1: Apply Faraday's First Law The relationship is given by: $m = Zit$ where:

• $m$: mass of substan\ce deposited
• $Z$: electrochemical equivalent (ECE)
• $i$: Current in amperes

Step 2: Define Electrochemical Equivalent (ECE) By definition, if $Q = 1$ coulomb is passed, then: $m = Z$ Thus, the mass deposited by 1 coulomb of charge is equal to 1 electrochemical equivalent of that substan\ce.

$\boxed{\text{Answer: (b) 1 electrochemical equivalent of silver}}$