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STD 11 -p-Block elements - I — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 -p-Block elements - I4 Marks
MCQ
Choose the Incorrect statement/ reaction
  • ✓
    $BC{l_3} + N{H_3}\left( g \right) \to BC{l_2}\left( {N{H_2}} \right) + HCl$
  • B
    $AlCl_3$ in aqueous solutions forms octahedral, $[Al(H_2O)_6]^{3+}$ ions.
  • C
     The conjugated base in aqueous solution of $H_3BO_3$ is $[B(OH)_4]^{-1}$.
  • D
    Aqueous solution of borax , $Na_2B_4O_7. 10H_2O$, which is a buffer system forms basic solution.
✓

Answer

Correct option: A.
$BC{l_3} + N{H_3}\left( g \right) \to BC{l_2}\left( {N{H_2}} \right) + HCl$
a
$(1)$ $\mathrm{BCl}_{3}$ with gaseous ammonia forms an adduct, $\mathrm{BCl}_{3} . \mathrm{NH}_{3}$ not a substitution product.

$(2)$ $\mathrm{H}_{3} \mathrm{BO}_{3}$ is weak, non-protonic, lewis acid

$(3)$ $\mathrm{H}_{3} \mathrm{BO}_{3}+\mathrm{Na}\left(\mathrm{B}(\mathrm{OH})_{4}\right) \rightarrow$ equimolar amounts are produced and $\mathrm{pH}=\mathrm{pKa}\left(\mathrm{H}_{3} \mathrm{BO}_{3}\right)=9.25,$ lies in basic range.

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