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For the electro chemical cell $M\left|M^{2+}\right| X \mid X^{2-}$ if $E_{\left(M^{2+} / M\right)}^0=0.46 V $ and  $ E_{\left(X / X^{2-}\right.}^0=0.34 V$ Which of the following is correct ?

• A
  $E_{\text {cell }}=-0.80 V$
• B
  $M + X \rightarrow M ^2+ X ^{2-}$ is a spontaneous reaction
• C
  $M ^{2+}+ X ^{2-} \rightarrow M + X$ is a spontaneous reaction
• D
  $E _{ ccll }=0.80 V$