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JEE Advanced Chemistry Practical Chemistry 2025 JEE Advanced 2025 (Paper 1)

JEE Advanced Chemistry Question (2025) — Solution

Question

The correct match of the group reagents in List-I for precipitating the metal ion given in List-II from solutions, is LIST - I LIST - II (P) Passing H _2 ~S in the presence of NH _4 OH (1) Cu ^ 2+ (Q) ( NH _4 )_2 CO _3 in the presence of NH _4 OH (2) Al ^ 3+ (R) NH _4 OH in the presence of NH _4 Cl (3) Mn ^ 2+ (S) Passing H _2 ~S in the presence of dilute HCl (4) Ba ^ 2+ (5) Mg ^ 2+

Options

  1. A. P 3 ; Q 4 ; R 2 ; S 1
  2. B. P 4 ; Q 2 ; R 3 ; S 1
  3. C. P 3 ; Q 4 ; R 1 ; S 5
  4. D. P 5 ; Q 3 ; R 2 ; S 4

Answer

A. P 3 ; Q 4 ; R 2 ; S 1

Step-by-step solution

Mn ^ +2 H _2 ~S + NH _4 OH Pink/buff ppt. MnS Ba ^ +2 ( NH _4 )_2 CO _3+ NH _4 OH White ppt. BaCO _3 Al ^ +3 NH _4 Cl + NH _4 OH White ppt. Al ( OH )_3 Cu ^ +2 H _2 ~S + HCl (dil.) Black ppt. CuS

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