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In heterogeneous catalytic reactions inv...

In heterogeneous catalytic reactions involving solid catalyst and gaseous reactants, the catalysts, most generally used are 

A

metals

B

metal oxides only

C

transition metals only

D

transition metals and transition metal oxides

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The correct Answer is:
D
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AAKASH SERIES-SURFACE CHEMISTRY-LEVEL - I (EXERCISE - I)(CATALYSIS)
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