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How will you con.firm that a gas is CO2 ...

How will you con.firm that a gas is `CO_2` but not `SO_2` ?

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Both the gases are passed through `K_2Cr_2O_7` solution, `SO_2` turns the orange colour of `K_2Cr_2O_7` solution green but `CO_2` does not.
`underset("ovange")(K_2Cr_2O_7)+H_2SO_4+3SO_2 to underset("green")(Cr_2(SO_4)_3)+ K_2SO_4 + H_2O`
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