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- 1. Multiple Choice
General Requirements for a Good Metallochromic
Indicator are the following, except:
have two distinct colors
The color reaction of the indicator with the metal should be specific
The metal- indicator complex should have sufficient stability, but it should be less stable than metal-EDTA complex
The metal- indicator complex should have sufficient stability, but it should be more stable than metal-EDTA complex
- 2. Multiple Choice
Murexide form satble complex with all the following metals, except:
Ca+2
Co+
Mg+2
Ni+
- 3. Multiple Choice
the back titration is useful in the following cases, except:
If the metal ion precipitate at the pH of the titration
If there is no suitable indicator
if the sample is soluble in water
If the reaction between EDTA and the metal ion is too slow
- 4. Multiple Choice
to increase the EDTA selectivity, we can apply the following procedures, except:
control the pH
Adjustment of the oxidation state
Classical separation
use of different buffer type
- 5. Poll
give a percentage to how far you understand this lecture
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