Consider the Reaction Given By
-In Standard Notation, the Fractional Surface Coverage

Consider the reaction given by $$\begin{array} { l } M \stackrel { k _ { 1 } } { \longrightarrow } M _ { ads } ^ { + } + e ^ { - } \\\\M _ { a d s} ^ { + } \frac { k _ { 2 } } { \longleftarrow k _ { - 2 } } M _ { s o l } ^ { 2 + } + e ^ { - }\end{array}$$ .
-In standard notation, the fractional surface coverage ( $\theta$ ) of the adsorbed intermediate $$M _ { a ds } ^ { + }$$
is given by

A) $$\Gamma \frac { d \theta } { d t } = k _ { 1 } ( 1 - \theta ) - k _ { 2 } \theta - k _ { - 2 } C _ { M _ { a d } ^ { 2 + } }$$
B) $$\Gamma \frac { d \theta } { d t } = k _ { 1 } ( 1 - \theta ) - k _ { 2 } \theta + k _ { - 2 } C _ { M _ { sol } ^ { +2} } ( 1 - \theta )$$
C) $$\Gamma \frac { d \theta } { d t } = k _ { 1 } ( 1 - \theta ) - k _ { 2 } \theta$$
D) $$\Gamma \frac { d \theta } { d t } = k _ { 1 } ( 1 - \theta ) - k _ { - 2 } C _ {M_ {sol } ^ { + 2 } }$$