The largest and the smallest species among $Mg$ , $Mg^2$, $Al$ and $Al^{3+}$ are Al and $Mg^{2+}$ respectively
Given species:
Mg, Mg2+, Al and Al3+
We compare their sizes.
Cations are smaller than their parent atoms because loss of electrons increases effective nuclear attraction.
Across a period, atomic size decreases from Mg to Al.
Thus:
Mg is larger than Al
Mg2+ is larger than Al3+ (both are isoelectronic, but Al3+ has greater nuclear charge, so it is smaller)
Correct order of size:
Mg > Al > Mg2+ > Al3+
Therefore:
Largest species = Mg
Smallest species = Al3+
Hence the statement , largest is Al and smallest is Mg2+ is incorrect.
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[Given: Molar mass in $\text{g mol}^{-1}$ $\text{Cr} : 52; \text{Cl}: 35.5, \text{Ag}: 108, \text{O}: 16, \text{H}: 1$] - Consider the following reactions :
$\text{NaCl} + \text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 \rightarrow \text{A} + \text{KHSO}_4 + \text{NaHSO}_4 + \text{H}_2\text{O}$
$\text{A} + \text{NaOH} \rightarrow \text{B} + \text{NaCl} + \text{H}_2\text{O}$
$\text{B} + \text{H}_2\text{SO}_4 + \text{H}_2\text{O}_2 \rightarrow \text{C} + \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}$
In the product 'C', 'X' is the number of $\text{O}_2^{2-}$ units, 'Y' is the total number oxygen atoms present and 'Z' is the oxidation state of Cr. The value of X + Y + Z is ____________. - Identify the metal ions among $\text{Co}^{2+}, \text{Ni}^{2+}, \text{Fe}^{2+}, \text{V}^{3+}$ and $\text{Ti}^{2+}$ having a spin-only magnetic moment value more than $3.0\text{ BM}$. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is __________.
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