QC Violet 101-200

1) The substance being analyzed is the:

• A) Titrant
• B) Indicator
• C) Salt
• D) Analyte

2) In infrared spectrometry, water is not used as solvent for the sample because the water will:

• A) Absorb IR radiation
• B) Dissolve the sodium chloride cell holder
• C) Not dissolve the sample
• D) A and B

3) The law related to spectrometry wherein the power of transmitted light decreases exponentially as the thickness of the solution increases arithmetically is:

• A) Charle’s
• B) Beer’s
• C) Lambert’s
• D) Henry’s

4) The end point in iodimetry using starch TS as indicator is:

• A) Blue color
• B) Disappearance of blue color
• C) Greenish blue color
• D) A or C

5) The type of titration in ultimate assay of alkaloids is:

• A) Direct
• B) Residual
• C) Back
• D) B and C

6) What would be the aldehyde content of peppermint oil if the sample used was 15mL and the insoluble portion as read in the graduated neck of the Cassia flask was 2.2mL. The percentage of aldehyde content is:

• A) 85.33
• B) 83.33
• C) 84.30
• D) 14.67

7) A sample of Magnesia Magma weighing 12.35g was dissolved in 50mL of 1.0340N sulfuric acid and titrated until end point is reached consuming 24.6mL of 1.1255N sodium hydroxide solution. The percentage of MgO content is: At.Wt. of Mg = 24.3: O = 16

• A) 3.92
• B) 4.0
• C) 3.85
• D) 3.91

8) The alcohol content of a volatile oil can be determined by:

• A) Bisulfite method
• B) Complexation process
• C) Acetylization process
• D) A and C

9) The index of refraction of a volatile oil can be determined by:

• A) Spectrophotometer
• B) Pycnometer
• C) Refractometer
• D) Polarimeter

10) Turbidimetric and nephelometric methods of assay are applied to:

• A) Suspensions
• B) Solutions
• C) Colored samples
• D) A and B