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To the salt solution of $M C l_{2}$ on addition of $K_{2} C r O_{4}$ solution does not gives yellow colour ppt but gives yellow colour solution, on addition of ammonium oxalate gives white ppt of $M C_{2} O_{4}$ which is insoluble in hot acetic acid. The cation, $M^{+ 2}$ is ?

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$B a^{+ 2}$

$S r^{+ 2}$

$C a^{+ 2}$

$M g^{+ 2}$

answer is C.

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Detailed Solution

$B a^{+ 2} + C r O_{4}^{- 2} \to$ Yellow ppt of $B a C r O_{4}$

$B a^{+ 2} + C_{2} O_{4}^{- 2} \to$ White ppt. of $B a C_{2} O_{4}$

which is soluble in hot acetic acid

$C a^{+ 2} + C r O_{4}^{- 2} \to$ Yellow colour solution, not ppt

$C a^{+ 2} + C_{2} O_{4}^{- 2} \to C a C_{2} O_{4}$ White ppt which is insoluble in Acetic acid

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