498 
temperature coefficients are greater than unity even in presence of 
MgSO, or HCl; 
(1) KI + K,S,0„ (2) KI + K.Fe (CN)„ (3) KI + HNO,. 
On the other hand, the following reactions are almost instantaneous 
even at 0° and their temperature coefficients are about unity : 
(J) KI 4- H,SO, + KMnO, (2) KI + Br, (3) KI + Cl. 
Chemical Laboraiory, Muir Central College, 
Allahabad, India. 
