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STATEMENT - 1 : H(2)S in acidic medium i...

STATEMENT - 1 : `H_(2)S` in acidic medium is the group reagent for `II^(nd)` group in basic radical.
STATEMENT - 2 : `K_(sp)` of suphides of `II^(nd)` group ions is less.
STATEMENT - 3 : All sulphides of `II^(nd)` group element are coloured.

A

FTF

B

TTT

C

FFF

D

TTF

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will evaluate each statement one by one, determining their truthfulness based on the principles of qualitative analysis. ### Step 1: Evaluate Statement 1 **Statement 1:** `H2S` in acidic medium is the group reagent for `II^(nd)` group in basic radical. - **Explanation:** In qualitative analysis, the group reagent for the second group of cations (which includes ions like Hg²⁺, Pb²⁺, Cu²⁺, etc.) is indeed `H2S` when used in an acidic medium (usually with dilute HCl). This is because `H2S` reacts with these cations to form insoluble sulfides, which precipitate out of solution. Therefore, this statement is **True**. ### Step 2: Evaluate Statement 2 **Statement 2:** `Ksp` of sulfides of `II^(nd)` group ions is less. - **Explanation:** The solubility product constant (`Ksp`) of sulfides in an acidic medium is indeed lower due to the common ion effect. When `H2S` is present, the concentration of sulfide ions (S²⁻) decreases, which shifts the equilibrium of the dissolution reaction to the left, resulting in a lower `Ksp`. Hence, this statement is also **True**. ### Step 3: Evaluate Statement 3 **Statement 3:** All sulfides of `II^(nd)` group elements are colored. - **Explanation:** The sulfides of the second group cations exhibit various colors. For instance: - CuS, PbS, and HgS are black. - Sb₂S₃ is orange. - Bi₂S₃ is brown. - CdS is yellow. Therefore, while many sulfides are colored, not all sulfides of the second group are colored (e.g., some may be colorless or have very light colors). Consequently, this statement is **False**. ### Conclusion - **Statement 1:** True - **Statement 2:** True - **Statement 3:** False ### Final Answer The correct evaluation of the statements is: - Statement 1: True - Statement 2: True - Statement 3: False
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