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answer the following What element is being reduced in Part B? in Part C? in Part

ID: 825117 • Letter: A

Question

answer the following

What element is being reduced in Part B? in Part C? in Part D? Sulfuric acid is present in all cases. Why does it react differently? The highest possible oxidation state for the halogens is +7, and the lowest possible is -1. Which of the following could not disproportionate? BrO- Cl2 Br- HClO4 IO- The highest possible oxidation state for the halogens is +7, and the lowest possible is -1. Which of the following could not disproportionate? I- H5IO6 BrO2 HClO I2 if the procedure in Part D is performed using KI and NaBrO3, the reaction is What color is expected in the dichloroethane layer? A student performed Part A first with his unknown. The dichloroethane layer turned purple. Identify the anion. Another student performed Part B first with her unknown, adding MnO2 and 9 M H2SO4 to her unknown solid. There was no color change in the dicholoethane layer. Which ions could be ruled out by this observation? What test should be performed next? A third student performed Part D first, substituting his unknown for the NaBrO3. The dichloroethane layer turned dark orange. Which ions could be ruled out? What test should be performed next?

Explanation / Answer

2-Br-

as it can not be reduced furher.Its already in its lowest state

HClO4

as its already in its highest oxidation state.


3-I-

already in its lowest oxidation state.


4- brown colour


5a-I-

b-Br-

c-I-