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# Carbogen is a mixture of

$\begin{array}{1 1}(a)\;O_2\;and\;CO&(b)\;CO_2+O_2\\(c)\;CO_2+O_3&(d)\;O_3+CO\end{array}$

Carbogen is a mixture of $CO_2+O_2$
Hence (b) is the correct answer.