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  4. K2Cr2O7 on heating with aqueous NaOH gives

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Q. $K_2Cr_2O_7 $ on heating with aqueous $NaOH$ gives

AIPMTAIPMT 1997The d-and f-Block Elements

Solution:

$K _{2} Cr _{2} O _{7}+2 NaOH \longrightarrow K _{2} CrO _{4}+ Na _{2} CrO _{4}+ H _{2} O$
Hence, $CrO _{4}^{2-}$ ion is obtained.