Three compounds X, Y and Z were taken into three different laboratory vessels and they were carried out by a chemist in his car. The car caught fire due to short circuit and the chemist came out of th

Question

Three compounds X, Y and Z were taken into three different laboratory vessels 
and they were carried out by a chemist in his car. The car caught fire due to 
short circuit and the chemist came out of the car and noticed following 
observations :

Prashant Kotian · Accepted Answer

Correct answer: B. 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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