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JEE Main 202524 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
24 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2025 · 24 January · Evening Shift · Chemistry · Coordination Compounds

When Ethane-1,2-diamine is added progressively to an aqueous...

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be :

Options

  1. AViolet →\rightarrow Blue →\rightarrow Pale Blue →\rightarrow Green
  2. BPale Blue →\rightarrow Blue →\rightarrow Green →\rightarrow Violet
  3. CGreen →\rightarrow Pale Blue →\rightarrow Blue →\rightarrow Violet
  4. DPale Blue →\rightarrow Blue →\rightarrow Violet →\rightarrow Green

Correct answer

C. Green →\rightarrow Pale Blue →\rightarrow Blue →\rightarrow Violet

Step-by-step solution

[Ni(H2O)6](aq)+2+en(aq)→[Ni(H2O)4(en)](aq)+2+2H2O\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]_{(\mathrm{aq})}^{+2}+\mathrm{en}_{(\mathrm{aq})} \rightarrow\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_4(\mathrm{en})\right]_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_2 \mathrm{O} Green [Ni(H2O)4(en)](aq)+2+en(aq)→[Ni(H2O)2(en)2](aq)+2+2H2O\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_4(\mathrm{en})\right]_{(\mathrm{aq})}^{+2}+\mathrm{en}_{(\mathrm{aq})} \rightarrow\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_2(\mathrm{en})_2\right]_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_2 \mathrm{O} Pale Blue [Ni(H2O)2(en)](aq)+2+en(aq)→[Ni(en)3](aq)+2+2H2O\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_2(\mathrm{en})\right]_{(\mathrm{aq})}^{+2}+\mathrm{en}_{(\mathrm{aq})} \rightarrow\left[\mathrm{Ni}(\mathrm{en})_3\right]_{(\mathrm{aq})}^{+2}+2 \mathrm{H}_2 \mathrm{O} Blue / purple
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