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For the electro chemical cell $ M | M^{+} || X^{-} | X, E^{0}(M^{+} | M)=0.44\;V$ and $E^{0} (X | X ^{-})=0.33\;V.$ Which one of the following is true for this data?

(a) $M+X \to M^{+}+ X^{-} $ is a spontaneous reaction

(b) $M^{+}+X^{-} \to M+ X $ is a spontaneous reaction

(c) $E_{cell}=0.77\;V$

(d) $ E_{cell}=-0.77\;V$

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