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WorksheetsAnalytical Chemistry Quiz Test I
Total questions: 17
Worksheet time: 9mins
What is one method used to express accuracy in analytical chemistry?
Standard deviation
Signal-to-noise ratio
Relative error
Coefficient of variation
Gross errors in analytical data are typically caused by____.
Instrument malfunction
Inaccurate calibration
Incorrect calculations
Human mistakes during measurement
The estimation of glucose using Fehling’s solution is primarily based on____.
Redox titration
Acid-base titration
Precipitation reaction
Complexometric titration
The reagent that commonly oxidizes glucose to gluconic acid during its estimation is______.
Benedict's solution
Fehling's solution
Tollen's reagent
Barfoed's reagent
Thermogravimetric analysis (TGA) is based on____.
Mass change
Volume change
Heat flow
Conductivity
The component used to measure heat flow in DSC is____.
Thermocouple
Balance
Microscope
Calorimeter
Principle of colorimetry and spectrophotometry______.
Conductivity
Light absorption
Mass change
Volume change
Unit of absorbance___.
%T
M
AU
g/mL
Elution in column chromatography____.
Packing column
Washing impurities
Separating components
Analyzing components
Solvent for non-polar compounds in TLC_______.
Water
Hexane
Ethanol
Acetic acid
Which of the following methods is used to express precision in analytical data?
Range
Sensitivity
Toxicity index
Mean deviation
In the Fehling’s solution method for glucose estimation, sulfuric acid is used to___
Act as a reducing agent
Stabilize the Fehling’s solution
Provide an acidic environment for the reaction
Precipitate the glucose
Differential thermal analysis (DTA) measures___.
Mass change
Heat flow
Volume change
Conductivity
The parameter NOT measured in DSC is___.
Mass
Enthalpy
Heat capacity
Phase transition
Rf in chromatography_____.
Relative fluidity
Relative flow
Retention factor
Reaction factor
Solvents in paper chromatography____.
Water & ethanol
Hexane & chloroform
Ethanol & acetone
Ethyl acetate and methanol
What is the primary purpose of establishing safe limits for chemical exposure in the laboratory?
To minimize waste generation
To ensure efficient disposal methods
To protect personnel from harmful effect
To reduce laboratory expenses
