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diff --git a/1427/CH4/EX4.2/4_2.sce b/1427/CH4/EX4.2/4_2.sce
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+//ques-4.2
+//Calculating COD of given sample
+clc
+v1=5.5;//volume of ferrous ammonium sulphate(FAS) required by unreacted dichromate (in mL)
+v2=26;//volume of FAS in sample (in mL)
+n=0.1;//normality of FAS
+V=25;//volume of distilled water (in mL)
+//1000mL of 1N FAS = 8g of oxygen
+O=(8*n*(v2-v1))/1000;//oxygen in 25mL sample (in g)
+O=O*(1000/25);//oxygen in 1L sample (in g)
+printf("COD of the given sample is %d ppm.",O*1000);