In salts of polyatomic anion, as polarising power of cation increases, thermal stability of the salt decreases, and decomposed species may further undergo redox reaction.

Question

In salts of polyatomic anion, as polarising power of cation increases, thermal 
stability of the salt decreases, and decomposed species may further undergo 
redox reaction.

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Identify the initial state of the reactants. Zinc hydroxide, Zn(OH)2↓, is an insoluble amphoteric white precipitate. Step 2: Observe the reaction with strong base. When excess sodium hydroxide (NaOH) is added, the precipitate reacts to form soluble sodium zincate (Na2ZnO2). Step 3: Because the insoluble precipitate dissolves to form a clear solution of a soluble complex salt, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).

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