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. Sodium tetrahydroxoaluminate, Na[Al(OH)4], is a soluble complex that forms a clear solution in water. Step 2: Analyze the reaction with CO2. Bubbling carbon dioxide gas reduces the pH of the basic solution, decomposing the complex and forming insoluble aluminium hydroxide, Al(OH)3↓. Step 3: Since a solid precipitate (Al(OH)3↓) is formed from soluble species, this reaction is a precipitate formation reaction (type A). Thus, the correct option is (a).

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