Two solid compounds \( A \) and \( B \) dissociate into gaseous products at \( 20^{\circ} \mathr...

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Two solid compounds \( A \) and \( B \) dissociate into gaseous products at \( 20^{\circ} \mathrm{C} \) as :
(i) \( A(s) \rightleftharpoons A^{\prime}(g)+H_{2} S(g) \)
(ii) \( B(s) \rightleftharpoons B^{\prime}(g)+H_{2} S(g) \)
At \( 20^{\circ} \mathrm{C} \) pressure over excess solid \( A \) is \( 50 \mathrm{~mm} \) and that over excess solid \( B \) is \( 68 \mathrm{~mm} \). Find :
show that the total pressure of gas over the solid mixture would be \( 84.4 \mathrm{~mm} \).
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