MCQ
$B{r^ - }$ is converted into $B{r_2}$ by using
- ✓$C{l_2}$
- BConc. $HCl$
- C$HBr$
- D${H_2}S$
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Note: py $=$ pyridine
Given: Atomic numbers of $Fe , Co , Ni$ and $Cu$ are $26,27,28$ and $29$ , respectively)
$(A)$ $\left[ FeCl _4\right]^{-}$and $\left[ Fe ( CO )_4\right]^{2-}$
$(B)$ $\left[ Co ( CO )_4\right]^{-}$and $\left[ CoCl _4\right]^{2-}$
$(C)$ $\left[ Ni ( CO )_4\right]$ and $\left[ Ni ( CN )_4\right]^{2-}$
$(D)$ $\left[ Cu ( py )_4\right]^{+}$and $\left[ Cu ( CN )_4\right]^{3-}$