The electrochemical equivalent of a metal is $3.3 \times 10^{-7} \ kg/C$. The mass of the metal liberated at the cathode when a $3 \ A$ current is passed for $2 \ s$ will be:
- A$19.8 \times 10^{-7} \ kg$
- B$9.39 \times 10^{-7} \ kg$
- C$6.6 \times 10^{-7} \ kg$
- D$1.1 \times 10^{-7} \ kg$
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