38 What is the change in oxidation number for chromium in the redox reaction 2Cr

Question

38 What is the change in oxidation number for chromium in the redox reaction 2Cr2O3+3C arrow 4Cr+3CO2 39 Most reaction are carried out in liquid solution or in the gaseous phase because in such situations A) activation energies are higher B) it is easier for reactants to come in contact with each other C) kinetic energies of reactants are lesser. D) products are less apt to decompose . 40. The minimum combined kinetic energy reactant particles must possess in order for their collision to result in a reaction is called the A) dissociation energy. B) collision energy. C) activation energy. D) orientation energy. 41. Whether a reaction is exothermic or endothermic is determined by A) the salvation energy B) the physical slate of the reactants. C) how reactant and product potential energies compare. D) whether a catalyst is present. 42. Catalysts arc correctly characterized by each of the following statements except one. The exception is A) they can be either solids, liquids or gases. B) they lower the activation energy for a reaction. C) they do not actively participate in a reaction. D) they are not consumed in a reaction. 43. For a system at chemical equilibrium, A) forward and reserve reaction rates are equal. B) forward and reverse reaction rates are zero. C) reactant and product concentrations are equal. D) reactant and product concentrations are zero.

Explanation / Answer

d is the answer.

As in Cr2O3

The Oxidation State of Cr => 2x-3*2=0,

2x=6

x=+3

In the products ,Cr is without any charge.So the Oxidation state is zero.

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