JEE Mains · Chemistry · STD 11 -p-Block elements - I
The correct statements from the following are : \((A)\) The decreasing order of atomic radii of group \(13\) elements is \(\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}\). \((B)\) Down the group \(13\) electronegativity decreases from top to bottom. \((C)\) \(\mathrm{Al}\) dissolves in dil. \(\mathrm{HCl}\) and liberate \(\mathrm{H}_2\) but conc. \(\mathrm{HNO}_3\) renders Al passive by forming a protective oxide layer on the surface. \((D)\) All elements of group \(13\) exhibits highly stable +1 oxidation state. \((E)\) Hybridisation of \(\mathrm{Al}\) in \(\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) ion is \(\mathrm{sp}^3 \mathrm{~d}^2\). Choose the correct answer from the options given below:
- A \((C)\) and \((E)\) only
- B \((A)\), \((C)\) and \((E)\) only
- C \((A)\), \((B)\), \((C)\) and \((E)\) only
- D \((A)\) and \((C)\) only
Answer & Solution
Correct Answer
(A) \((C)\) and \((E)\) only
Step-by-step Solution
Detailed explanation
\(A\). size order \(\mathrm{T} \ell>\mathrm{In}>\mathrm{Al}>\mathrm{Ga}>\mathrm{B}\) \(B\). Electronegativity order \(\mathrm{B}>\mathrm{Al}<\mathrm{Ga}<\operatorname{In}<\mathrm{T} \ell\) \(D\). \(\mathrm{B}, \mathrm{Al}\) are more stable in \(+3\) oxidation state So, only…
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