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  4. Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of

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Q. Acidified $K_2Cr_2O_7 $ solution turns green when $Na_2SO_3 $ is added to it. This is due to the formation of

AIPMTAIPMT 2011The d-and f-Block Elements

Solution:

$K _{2} Cr _{2} O _{7}$ is oxidising reagent.
$K _{2} Cr _{2} O _{7} +3 Na _{2} SO _{3}+4 H _{2} SO _{4} \longrightarrow 3 Na _{2} SO _{4}+ K _{2} SO _{4}+ Cr _{2}\left( SO _{4}\right)_{3}+4 H _{2} O$