After dissolving a dark residue in 6M HNO_3, followed by addition of 6M NH_3, a

Question

After dissolving a dark residue in 6M HNO_3, followed by addition of 6M NH_3, a blue solution with a white precipitate was obtained Which of the following could possibly be contained in the dark residue? Fe(OH)_3 CdS Bi_2S_3 PbCrO_4 Which of the following could be in the blue solution? [Cu(NH_3)_4] CdS Bi_2S_3 PbCrO_4 Which kind of test paper should be used if you need to adjust the pH lo 0.5? Wide range alkacid paper. Blue litmus paper Short range alkacid paper. Red litmus paper We say a liquid has supercooled when it cools below its freezing point before crystallization occurs. it crystallizes slightly above its freezing point. it is an ideal solution. its freezing point has been lowered by a solute. What is the molarity of water? 30.5 M 45.5 M 55.5 M 65.5 M When initially precipitating Group III cations. Cn- precipitates as a hydroxide. a sulfide. a chloride. none of the above.

Explanation / Answer

7. Bi2S3 is dark colure residue (black-brown)

8. Cu(NH3)4 +2 complex is dark blue solution

9. blue litmus paper ANS(B)

10.The process of lowering the temperature of a liquid below its freezing point without it becoming a solid. ANS(A)

11. molarity of water = 1000g/L/18g= 55.49g/L= 55.5M (ANS:C)

12. in +3 oxidation state chromium precipitates as hydroxide( with ammoniua)

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