Which two sets of reactants best represent the amphoteric character of Zn(OH)2?
Set 1 : Zn(OH)2(s) and OH^-(aq)
Set 2 : Zn(OH)2(s) and H2O(l)
Set 3 : Zn(OH)2(s) and H^+(aq)
Set 4 : Zn(OH)2

Question

Which two sets of reactants best represent the amphoteric character of Zn(OH)2?
Set 1 : Zn(OH)2(s) and OH^-(aq)
Set 2 : Zn(OH)2(s) and H2O(l)
Set 3 : Zn(OH)2(s) and H^+(aq)
Set 4 : Zn(OH)2(s) and NH3(aq)

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Heavy metal nitrates like zinc nitrate, Zn(NO3)2, decompose upon heating to yield the metal oxide, nitrogen dioxide, and oxygen. Step 2: The chemical equation for the decomposition is: 2Zn(NO3)2 --Δ--> 2ZnO + 4NO2 + O2. Step 3: Therefore, the solid residue left after thermal decomposition is zinc oxide (ZnO), which corresponds to option (b).

💡 Solution & Explanation

Practice 22,000+ questions like this