Which of the following is not an example of a | vedclass

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(B) heterogeneous catalytic reaction involves a catalyst in a different phase from the reactants. $A$. Ostwald's process uses a $Pt$ catalyst (solid)

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Combustion of coal

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(B) heterogeneous catalytic reaction involves a catalyst in a different phase from the reactants. $A$. Ostwald's process uses a $Pt$ catalyst (solid) for the oxidation of $NH_3$ (gas),which is heterogeneous. $B$. Combustion of coal is a spontaneous oxidation reaction that does not require a catalyst. $C$. Hydrogenation of vegetable oils uses a $Ni$ catalyst (solid) for liquid oils and $H_2$ (gas),which is heterogeneous. $D$. Haber's process uses an $Fe$ catalyst (solid) for $N_2$ and $H_2$ (gases),which is heterogeneous. Therefore,the combustion of coal is not a catalytic reaction at all.

Which of the following is not an example of a heterogeneous catalytic reaction?

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