1.

For a reaction : H_(2)+Cl_(2) underset("Rate"=k)(overset(hv)to 2HCl) (i) Write the order and molecularity of this reaction. (ii) Write the unit of k.

Answer»

Solution :(i) When rate of the reaction is equal to k, that means it is reaction of ZERO ORDER. THUS
Order = 0 (zero)
Molecularity = 2
(ii) As k = rate and the UNITS of rate are moles `L^(-1)s^(-1)`. Therefore units of `k="mol L"^(-1)s^(-1)`.


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