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NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

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Question : 62
Total: 74
How is the presence of SO2 detected?
Solution:  
Presence of SO2 is detected by bringing a paper dipped in acidifiedpotassium dichromate near the gas. If the paper turns green, it shows thepresence of SO2 gas.
K2Cr2O7
Orange
+H2SO4+3SO2→K2SO4+
Cr2(SO4)3
Green
+H2O
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