MCQ
Which of the hydrogen halides forms salts like $KH{X_2}$ (where $X$ is a halogen atom)
- ✓$HF$
- B$HCl$
- C$HI$
- D$HBr$
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$(I)$ both the complexes can be high spin
$(II)$ $Ni(II)$ complex can very rarely be low spin.
$(III)$ with strong field ligands, $Mn(II)$ complexes can be low spin.
$(IV)$ aqueous solution of $Mn ( II )$ ions is yellow in color.

$CH_3-CH=O + C_6H_5-CH=O$ $\xrightarrow[\Delta ]{{\mathop O\limits^\Theta H(aq)}}$ $\mathop X\limits_{({C_4}{H_6}O)} $ $+$ $\mathop Y\limits_{({C_9}{H_8}O)} $