A white, water insoluble solid A turns yellow on heating and becomes w – InterviewSolution

1.	A white, water insoluble solid A turns yellow on heating and becomes white on cooling. Solid A gives a clear solution B when treated with HCl solution and C when treated with NaOH solution. When H_2 S is passed through B nothing is obtained. However if B is made neutral, H_2 S caused the precipitation of white compound D. Identify C.
Answer» `NaAlO_2` `NaBO_3` `ZnO` `Na_2 ZnO_2` SOLUTION :`A = ZnO , B = ZnCl_(2) , C = Na_(2) ZnO_(2) , D = Zn S `.

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