Kinetics and mechanism of oxidation of mixture of oxalic acid+malic acid by chromic acid in presence of hydrochloric acid has been investigated. The observed order in mixture of oxalic acid+malic acid is two, while order with respect to Cr (VI) is one. Rate of reaction is definitely altered in presence of hydrochloric acid hence reaction is catalysed. The rate however does not depend on the hydrogen ion concentration only. Thus acid effect is not due to specific acid catalysis, it seems to be due to general acid catalysis. The salt effect has been studied for the reaction. Effect of manganous sulphate has also been observed. Different parameters have also been calculated, like, temperature coefficient, dielectric constant, catalytic constant, activation energy etc. The resultant compound obtained was identified as formic acid by specific qualitative test and carbondioxide was tested as  usual.