Question

Carbon dioxide and Sulphur dioxide gas can be distinguished by using:

• A. Moist blue litmus paper
• B. Lime water
• C. Acidified potassium dichromate paper
• D. None of these

Answer 1

The correct option is C

Acidified potassium dichromate paper

The correct option is (iii) Acidified Potassium Dichromate paper.
1. When we introduce an acidified Potassium Dichromate ($K_{2}C{r}_2{O}_7$) paper to Carbon dioxide gas ($C{O}_2$ ), there is no change in the color of the paper.
2.When we introduce an acidified Potassium Dichromate ($K_{2}C{r}_2{O}_7$) paper to Sulphur dioxide gas ($S{O}_2$), the paper changes its color to green.
Carbon dioxide and Sulphur dioxide gas can be distinguished by using Acidified Potassium Dichromate paper.