solution is added to oxalic add
solution, the decolourisation is slow in the beginning but becomes
instantaneous after some time because
(a) 
is formed as the product
(b) reaction
is exothermic
(c) 
catalyses the reaction
(d) 
acts as autocatalyst
Answer:
(d) When 
solution is added to oxalic acid
solution, the decolourisation is slow in the beginning hut becomes instantaneous
after some time because acts as autocatalyst.
Reduction half
Oxidation
half 
Overall
equation
End point of this
reaction Colourless to light pink
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