The number of terminal oxygen atoms present in the product B obtained from the following reaction is
$F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} \to A + F e_{2} O_{3} + C O_{2}$
$A + H^{+} \to B + H_{2} O + N a^{+}$

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Solution

$F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} \to F e_{2} O_{3} + C O_{2} + N a_{2} C r O_{4} (A)$
$N a_{2} C r O_{4} + H^{+} \to C r_{2} O_{7}^{- 2} + H_{2} O + N a^{+}$

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F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} F u s i o n - --- \to [X] H^{+} - - \to H_{2} O [Y] H^{+} - - \to H_{2} O_{2} [Z]

B

C_{2} H_{5} O H + P C l_{3} \to C_{2} H_{5} C l + A

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