Qualitative Analysis - Result Question 46
####49.
Identify the metal $M$ and hence $M Cl _4$. Explain the difference in colours of $M Cl _4$ and $A$.
$(2005,4 M)$
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Solution:
- $\underset{\text { Colourless }}{MCl _4} \stackrel{Zn}{\longrightarrow}$ Purple coloured compound $(A)$
Colourless
$$ \underset{\text { Transition metal }}{M} \xrightarrow[\text { Air }]{\text { Moist }} B \text { (white fumes) } $$
$\Rightarrow \quad M=Ti, \quad A=\left[Ti\left(H _2 O\right) _6\right]^{3+} ; \quad B=TiO _2$
Ti (IV) contains no $d$-electron, while $d$ - $d$ transition of single electron of $Ti$ (III) will cause colour change.
