PRELIMS Analytical Chemistry PDF
PRELIMS Analytical Chemistry PDF
PRELIMS Analytical Chemistry PDF
PRELIMINARY EXAMINATION
Analytical Chemistry
2nd Semester, AY 2022-2023
Name: Date:
Block and Section: Instructor:____________
NOTE FOR PART I ONLY: Please read the instruction carefully. Avoid erasures, any form of
erasure is CONSIDERED WRONG. Cover your paper and avoid looking at your seatmate’s
paper. Double or triple check your answers before passing your paper. USING OF FRICTION
PEN IS NOT ALLOWED. Use black ink pen only.
PART I: Multiple Choice (45 Points)
Choose the LETTER of the correct answer.
b. analytical method
c. spectrometry
d. Chromatographic techniques
9. It is another separation technique with similarities to
chromatography that is particularly useful for the separation of charged species
a. Electrophoresis
b. analytical method
c. spectrometry
d. Chromatographic techniques
10. It consists of a detailed, stepwise list of instructions to be followed in the qualitative,
quantitative or structural analysis of a sample for one or more analytes and using a
specified technique.
a. electrophoresis
b. analytical method
c. spectrometry
d. Chromatographic techniques
11. It is the simplest device for delivering a known volume of a liquid reagent
a. graduated cylinder
b. transfer pipet
c. volumetric pipet
d. digital micropipet
12. It provides a more accurate method for delivering a known volume of solution.
a. graduated cylinder
b. transfer pipet
c. volumetric pipet
d. digital micropipet
13. what is the unit of molarity?
a. F
b. M
c. N
d. m
14. what is the unit of formality?
a. F
b. M
c. N
d. m
15. The 'correct' value for a measurement which remains unknown except when a standard
sample is being analyzed.
a. accuracy
b. error
c. mean
d. true result
16. The nearness of a measurement or result to the true value. Expressed in terms of error.
a. accuracy
b. error
c. mean
d. true result
17. The difference between the true result and the measured value. It is conveniently
expressed as an absolute error, defined as the actual difference between the true result
and the experimental value in the same units.
.
a. accuracy
b. error
c. mean
d. true result
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a. mean
b. precision
c. median
d. spread
20. The numerical difference between the highest and lowest results in a set. It is a measure
of precision.
a. mean
b. precision
c. median
d. spread
21. The numerical difference (e.g. From the Mean or Median), with respect to sign, between
an individual result and the mean or median of the set. It is expressed as a relative or
absolute value.
a. mean
b. precision
c. median
d. deviation
22. It is generally the more important characteristic of quantitative data to be assessed,
although consistency, as measured by precision, is of particular concern in some
29circumstances
a. accuracy
b. trueness
c. precision
d. deviation
23. It is a measure of the variability or dispersion within a set of replicated values or results
obtained under the same prescribed conditions, can be assessed in several ways.
a. accuracy
b. trueness
c. deviation
d. precision
24. This is a step in analytical approach wherein it answers the questions: What is the problem
context? What type of information is needed?
a. identify the problem
b. design experimental procedure
c. analyze experimental data
d. Conduct Experiment and Gather Data
25. In this step of analytical approach, the design criteria is established, the potential
interferents are identified, criteria are validated, analytical method to be used is
selected and the sampling strategy is determined.
a. identify the problem
b. design experimental
procedure
c. analyze experimental data
d. Conduct Experiment and Gather Data
26. In this step of analytical approach, the critical step is the calibration of the instruments
and equipment, standardization of the reagents and gathering of data
a. identify the problem
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Tel. No. (049) 576-4359
b. design experimental
procedure
c. analyze experimental data
d. Conduct Experiment and Gather Data
27. In this step of analytical approach, it answers the question “is the results sufficient?” or
“does the answer suggest a new problem?”
a. identify the problem
b. propose solution to problem
c. analyze experimental data
d. Conduct Experiment and Gather Data
28. In this step of analytical approach, the data is reduced and transformed complete with
appropriate statistical analysis and treatment, the results are verified and interpreted.
a. quality control
b. geological assays
c. medical and clinical studies
d. educatioon
30. Which of the following analytical techniques measures the weight of pure analyte or
compound of known stoichiometry?
a. Gravimetry
b. titrimetry
c. atomic and molecular spectrometry
d. mass spectrometry
31. Which of the following analytical techniques measures the volume of standard
reagent solution reacting with analyte?
a. atomic and molecular spectrometry
b. gravimetry
c. mass spectrometry
d. titrimetry
d. radiochemical analysis
35. Which of the following analytical techniques measures the characteristic ionizing nuclear
radiation emitted by the analyte?
36. Which of the following analytical techniques measures the electrical properties of the
analyte in a solution?
37. Which of the following analytical techniques measures the chemical/physical changes in
the analyte when heated or cooled?
38. It is the determination of the concentration of an analyte or reagent solution from its
reaction with a standard or primary standard.
a. Standardization
b. calibration
c. uncertainties
d. primary standards
39. It is required to establish the relation between a measured physico-chemical response
to an analyte and the amount or concentration of the analyte producing the response.
a. standardization
b. calibration
c. uncertainties
d. primary standards
40. It is the numerical difference between a measured value and true or accepted
value
a. absolute error
b. relative error
c. determine error
d. indeterminate error
41. It is the absolute error divided by the true or accepted value.
a. absolute error
b. relative error
c. determine error
d. indeterminate error
42. It is also known as systematic errors, or bias, these generally arise from determinate or
identifiable sources causing measured values to differ from a true or accepted value.
a. absolute error
b. relative error
c. determine error
d. indeterminate error
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43. It is also known as random errors, these arise from a variety of uncontrolled sources and
cause small random variations in a measured quantity when the measurement is
repeated a number of times, which always occur even under closely controlled
conditions.
.
a. absolute error
b. relative error
c. determine error
d. indeterminate error
44. Which of the following is not a type of Spectroscopy?
a. Gamma ray
b. X ray
c. Nuclear magnetic resonance
d. Sound
45. The precision of results obtained over a series of working sessions
a. accuracy
b. trueness
c. reproducibility
d. errors
3. A chemist dissolves 3.50 g of KIO3 (potassium iodate) and 6.23 g of KOH (potassium
hydroxide) in 805.05 g of water. The density of potassium iodate is 3.93 g/mL and potassium
hydroxide is 1.3 g/mL. What is the percentage concentration of each solute in the solution?
4.Express the answer in number 3 in terms of PPM, PPB, and PPT.
5. To what volume should you dilute 133 mL of an 7.90 M CuCl 2 solution so that 51.5 mL of the
diluted solution contains 4.49 g CuCl2?