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Transition metals combine with halogens ...

Transition metals combine with halogens at high temperature to form compounds called halides. On account of high activation energy , the reactions require high temperature to start, but once the the reaction is started , the heat of reaction is sufficient to maintain the continuity .
Metals in higher oxidation state form flourides as it is the most electronegative element . Flourides are ionic in nature . The chlorides , bromides and iodides have ionic as well as covalent character . Halides of metals is higher oxidation states are relatively unstable and hydrolysed very easily .
Aqueous solution of which compound will have `pH lt 7` ?

A

`TiCl_(4)`

B

`FeCl_(3)`

C

`CuSO_(4)`

D

All of these

Text Solution

AI Generated Solution

The correct Answer is:
To determine which aqueous solution will have a pH less than 7, we need to analyze the compounds given in the question: TiCl4, FeCl3, and CuSO4. ### Step 1: Analyze TiCl4 - **Dissociation**: When TiCl4 is dissolved in water, it dissociates into Ti⁴⁺ and Cl⁻ ions. - **Acid-Base Nature**: Ti⁴⁺ can hydrolyze to form Ti(OH)₄, which is a weak base. The Cl⁻ ion comes from HCl, a strong acid. - **Conclusion**: Since it is formed from a weak base (Ti(OH)₄) and a strong acid (HCl), TiCl4 will be acidic in nature, resulting in a pH less than 7. ### Step 2: Analyze FeCl3 - **Dissociation**: FeCl3 dissociates into Fe³⁺ and Cl⁻ ions in water. - **Acid-Base Nature**: Fe³⁺ can hydrolyze to form Fe(OH)₃, which is a weak base. The Cl⁻ ion again comes from HCl, a strong acid. - **Conclusion**: Similar to TiCl4, FeCl3 is formed from a weak base (Fe(OH)₃) and a strong acid (HCl), making it acidic and resulting in a pH less than 7. ### Step 3: Analyze CuSO4 - **Dissociation**: CuSO4 dissociates into Cu²⁺ and SO₄²⁻ ions. - **Acid-Base Nature**: Cu²⁺ can hydrolyze to form Cu(OH)₂, which is a weak base. The SO₄²⁻ ion comes from H₂SO₄, a strong acid. - **Conclusion**: CuSO4, like the previous compounds, is formed from a weak base (Cu(OH)₂) and a strong acid (H₂SO₄), leading to an acidic solution with a pH less than 7. ### Step 4: Final Conclusion - All three compounds (TiCl4, FeCl3, and CuSO4) lead to acidic solutions when dissolved in water, resulting in a pH less than 7. - Therefore, the correct answer is **D) All of these**.
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