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Solution


Q.

K2Cr2O7 paper acidified with dilute H2SO4 turns green when exposed to           [2023]
1 Hydrogen sulphide  
2 Sulphur dioxide  
3 Carbon dioxide  
4 Sulphur trioxide  

Ans.

(2)

Cr2O72-+2H++3SO2→2Cr3+(green)+3SO42-+H2O