Given reagents are HCl, NaOH, ZnCl₂, Na₂CO₃, NH₄Cl and Zn. Which of these reagent(s) can intensify hydrolysis of FeCl₃ when added to its solution

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NaOH, Na₂CO₃

NaOH, NH₄Cl, HCl

NH₄Cl, HCl, ZnCl₂

Na₂CO₃, NaOH + HCl

answer is A.

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Detailed Solution

The hydrolysis of FeCl₃ can be intensified by adding a strong base or a weak acid.

Out of the given reagents, option (a) NaOH and Na₂CO₃ both are bases and can intensify hydrolysis of FeCl₃.

Option (b) NH₄Cl and HCl are both acids, and HCl is a strong acid that can compete with the hydrolysis of FeCl₃. Therefore, option (b) cannot intensify the hydrolysis of FeCl₃.

Option (c) Na₂CO₃ is a base that can intensify the hydrolysis of FeCl₃, but adding NaOH and HCl together may neutralize each other's effects and not increase the hydrolysis of FeCl₃. Therefore, option (c) may or may not intensify the hydrolysis of FeCl₃.

Option (d) NH₄Cl is an acid that cannot intensify the hydrolysis of FeCl₃, while HCl and ZnCl₂ are both strong acids that can compete with the hydrolysis of FeCl₃. Therefore, option (d) cannot intensify the hydrolysis of FeCl₃.

Therefore, the correct answer is option (a) NaOH and Na₂CO₃.

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