Which of the following statements are true?
(i) Rate equation is obtained by experiment for complex reactions.
(ii) For simple reactions rate expressions is obtained from stoichiometric equation.
(iii) Rate constant is always equal to specific rate of reaction.
(iv) Rate constant has no units.

i, ii, iii

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ii, iii, iv

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i, ii

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iii, iv

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Solution

The correct option is A i, ii, iii
the rate constant has a unit for a different order of a reaction.

The rate constant, or the specific rate constant, is the proportionality constant in the equation that expresses the relationship between the rate of a chemical reaction and the concentrations of the reacting substances.

The stoichiometry of the reaction is indicated by placing stoichiometric coefficients before the chemical species. These are usually integer numbers, but in some bioenergetic processes, non-integer stoichiometries are known to pertain.

Thus, only the statement (iv) is incorrect.

Hence, the correct option is $A$

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