9) The color of Eriochrome Black T changed (from to) in comlexometric titration of EDTA slat mixture of Ca² and Mg 2+ a) green to yellow b) blue to pink c) wine red to blue. d) pink to colorless
9) The color of Eriochrome Black T changed (from to) in comlexometric titration of EDTA slat mixture of Ca² and Mg 2+ a) green to yellow b) blue to pink c) wine red to blue. d) pink to colorless
Chapter33: High-performance Liquid Chromatography
Section: Chapter Questions
Problem 33.17QAP
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Q 9 please
Transcribed Image Text:1) The coefficient of variation CV% of the data set shown below is
19.4, 195, 196, 19.8, 20.1. 20.3
b) 0.790
a) 0.125
c) 0.018 %
2) The error that can be corrected by calibration:
a) systematic error
b) gross error
c) random
d) rando error
3) One of the following indicators can be used to determine the end point of the second first proton
in H.PO.:
a) Eriochrome Black T
b) Phenolphthalein
c) Methyl orange d) Chromate ion
4) Ag+ Ch
AgCl. This is an example of
a) acid-base titration. b) precipitation titration. c) redox titration. d) complexation titration
5) Ag+ (SCN)
alacid-base titration. b) Volhard method.
d) 0.354
AgSCN) This is an example of
c) Fajan method. d) Moher method.
6) The indicator that used in Fjan method is
a) dichlorofluorescein b) murxide c) ferric ions (Fe) d) potassium chromate
7) the indicator that used in moher method MOHR method is
a) Eriochrome Black T
b) murxide c) ferric ions(Fe) d) potassium chromate
8) VOHLARD method for determination of chloride ions in the solution is an example of
a) acid-base titration. b) back titration. c) redox titration. d) complexation titration
9) The color of Eriochrome Black T changed (from to) in comlexometric titration of EDTA slat
mixture of Ca² and Mg 2+
a) green to yellow
b) blue to pink
d) pink to colorless
c) wine red to bluc
10) Which of these statements is not TRUE?
a-Phenolephtalene indicator pink in basic media
b-Methyl orange used to identify the first end
c-The primary standard for EDTA is ZnSO4 solution
d-EDTA considered as triprotic acid at pH=12
point of H₂PO4.
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