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The electrochemical equivlent of a metal is $3.3 \times 10^{-7}$ kg per coulomb. The mass of the metal liberated at the cathode when a 3A current is passed for 2 seconds will be

( A ) $6.6 \times 10^{-7}kg$
( B ) $1.1 \times 10^{-7}kg$
( C ) $9.9 \times 10^{-7}kg$
( D ) $19.8 \times 10^{-7}kg$

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