Question

2. Which of the following is precipitation as well as double displacement reaction
a. NaOH(aq)+HNO3(aq)--------NaNO3(aq) +H2O
b. Cu(s)+2AgNO3(aq)-------Cu(NO3)2(aq)+2Ag(s)
c. 2Hg(s) + O2(g)---- 2HgO(s)
Heat
d. FeCl3(aq)+ 3NH4OH(aq) ------ Fe(OH)3(s) + 3NH4Cl(aq)

Answer 1

Answer:

Fe Cl 3 (aq) ( 3NH4OH (aq) --------------- Fe(OH )3 (s) + 3NH4 Cl(aq)

Explanation:

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Answer 2

The reaction (D) FeCl₃ (aq) + 3NH₄OH(aq) → Fe(OH)₃(s) + 3NH₄Cl(aq) is the example of both precipitation as well as double displacement reaction.

• A double displacement reaction is a chemical reaction in which the reactants exchange their cations and anions.
• A precipitate reaction is a chemical reaction in which the reactants form an insoluble compound as a product.
• When ferric chloride reacts with the ammonium hydroxide, a red precipitate forms.
• The red precipitate formed is iron (III) hydroxide.
• And as the anions of both the reactants exchange during product formation. It is also a double displacement reaction.
• Hence, the correct answer is an option (D).