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temperature coefficients are greater than unity even in presence of 
MgsO, or HCI: 
(1) KI + K,S,0O,, (2) KI + K,Fe (CN),, (3) KI + HNO, 
On the other hand, the following reactions are almost instantaneous 
even at O° and their temperature coefficients are about unity: 
(1) KI + H,SO, + KMnO, (2) KI + Br, (3) KI + Cl. 
Chemical Laboratory, Muir Central College, 
Allahabad, India. 
