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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)

Aluminium chloride exists as dimmer, A l _ 2 C l _ 6 in solid state...

Aluminium chloride exists as dimmer, Al2Cl6A{l}_{2}C{l}_{6} in solid state as well as in solution: of non–polar solvents such as benzene. when dissolved in water, it gives

Options

  1. AAl2O3+6HClA{l}_{2}{O}_{3} + 6HCl
  2. BAl3++3Cl−Al^{3 +} + 3Cl^{-}
  3. C[Al(OH)6]3−+3HCl{\left[Al{\left(OH\right)}_{6}\right]}^{3 -} + 3HCl
  4. D[Al(H2O)6]+3+3Cl−{\left[Al{\left({H}_{2}O\right)}_{6}\right]}^{+ 3} + 3Cl^{-}

Correct answer

D. [Al(H2O)6]+3+3Cl−{\left[Al{\left({H}_{2}O\right)}_{6}\right]}^{+ 3} + 3Cl^{-}

Step-by-step solution

AlCl3AlC{l}_{3} is covalent but in water, it become ionic due to large hydration energy it dissociated as follows
AlCl3+6H2O⇌[Al(H2O)6]3++3Cl−AlC{l}_{3} + 6{H}_{2}O\overset{}{⇌}{\left[Al{\left({H}_{2}O\right)}_{6}\right]}^{3 +} + 3Cl^{-}
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