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JEE Main
Exam
JEE Main
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main · Chemistry · p Block Elements (Group 13 & 14)

AlCl_3 in water at pH < 7 forms

AlCl3\mathrm{AlCl}_3 in water at pH<7\mathrm{pH} < 7 forms

Options

  1. Atetrahedral Al(OH)4−\mathrm{Al}(\mathrm{OH})_4^{-}ions
  2. Boctahedral Al(OH)63−\mathrm{Al}(\mathrm{OH})_6^{3-} ions
  3. Csquare planar Al(OH)4−\mathrm{Al}(\mathrm{OH})_4^{-}ions
  4. Doctahedral Al(OH2)63+\mathrm{Al}\left(\mathrm{OH}_2\right)_6^{3+} ions

Correct answer

D. octahedral Al(OH2)63+\mathrm{Al}\left(\mathrm{OH}_2\right)_6^{3+} ions

Step-by-step solution

\mathrm{AlCl}_3form[Al(H2O)6]3+inwaterduetoacidicmediumform \left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+} in water due to acidic medium(\mathrm{pH} < 7).AlCl3+6H2O⟶[Al(H2O)6]3++3Cl⊖. \mathrm{AlCl}_3+6 \mathrm{H}_2 \mathrm{O} \longrightarrow\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}+3 \mathrm{Cl}^{\ominus}
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