ChTLE 2024 Analytical Chemistry Discriminating Questions

Which procedure produces a 0.2 M solution of Na2SO4?

A. Dissolving 0.2 M solid Na2SO4 in 500 mL water.

B. Diluting 400 mL of 0.3 M Na2SO4 to a final volume of 1.0 L.

C. Mixing 500 mL of 0.4 M NaOH with 500 mL of 0.2 M Na2SO4.

D. Mixing 300 mL of 1.2 M NaOH with 600 mL of 0.3 M Na2SO4.

D.

Which is NOT an acceptable name for Hg2Cl2?

A. Mercury (II) chloride

B. Mercury (I) chloride

C. Mercurous chloride

D. Dimercury chloride

A.

A drug sample contains 10.0 ug//L of its active ingredient. A 5.0 ug/L of spike was added to a replicate portion of the drug. The spiked sample gave a concentration of 14.6 ug/L. What is the percent recovery of the spike?

A. 34

B. 96

C. 37

D. 92

D.

A type of blank that is commonly used with techniques, such as spectrophotometry, to zero the instrument before measuring test samples and other blanks.

A. Reagent blank

B. Method blank

C. Trip blank

D. Field blank

A.

According to DTI-BPS, what color designations correspond to a foam type fire extinguisher?

A. red body, white band

B. red body, black band

C. red body, blue band

D. light green body, white band

C.

What are the components of a fire triangle?

A. oxygen, heat, material

B. oxygen, fuel, heat

C. air, fuel, spark

D. air, fuel, fire

B.

These materials ignite due to the rapid oxidation by oxygen or moisture in the air.

A. Water reactive substances

B. Pyrophoric substances

C. Explosives

D. Flammables

B.

Which of the following acids are stored properly?

A. hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid

B. hydrochloric acid, acetic acid, sulfuric acid, lactic acid

C. lactic acid, acetic acid, trichloroacetic acid

D. lactic acid, acetic acid, perchloric acid

C.

This refers to the net result of uptake, transformation, and elimination of a substance in an organism due to all routes of exposure.

A. Bioaccumulation

B. Bioavailability

C. Availability

D. Bioconcentration

A.

A hazardous waste characteristic that refers to substances that are unstable under normal conditions and readily undergo violent reaction without detonation.

A. Ignitability

B. Corrosivity

C. Reactivity

D. Toxicity

C.

Which of the following is arranged in increasing atomic size?

A. Cs < Ca < O < Ne

B. Cs < O < Ca < Ne

C. Ne < Ca < O < Cs

D. Ne < O < Ca < Cs

D.

Which does NOT follow octet rule?

A. CH4

B. CCl4

C. HCl

D. NO2

D.

Which of the following statements is true?

A. BrF5: trigonal pyramidal

B. ClF3: T-shaped

C. PCl5: see-saw

D. SF4: trigonal bipyramidal

B.

It is a non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used.

A. Measurement uncertainty

B. Accuracy

C. Error

D. Precision

A.

Which of the following is the most appropriate container for hexane?

A. Glass bottle

B. Amber bottle

C. Plastic bottle

D. None of these

B.

Minimum concentration of a substance that can be measured and reported with confidence at the analyte concentration is greater than zero refers to ___________________________________.

A. Lower warning limit

B. Method detection limit

C. Control limit

D. Limit of quantitation

B.

Which of the following focuses on Quality Management Systems?

A. ISO 9001

B. ISO 17025

C. ISO 15189

D. GLP

A.

A 30 L gas initially has 110 kPa and 147 deg-C. Its volume became 40 L and the pressure increased to 120 kPa. What is the new temperature?

A. 65 deg-C

B. 214 deg-C

C. 338 deg-C

D. 611 deg-C

C.

Alcohols and carboxylic acids have -OH groups. What type of chemical bond occurs between the oxygen and hydrogen groups?

A. ionic

B. polar covalent

C. hydrogen

D. nonpolar covalent

B.

What IMFA is(are) present in this compound?

CH3CH2CH2CH2CH2CHO

A. vDW only

B. DDI only

C. vDW and DDI

D. vDW, DDI, and HB

C.

A type of analysis in terms of sample size that can resolve fine-scale variations in chemical elements, as well as determine the presence and distribution of different phases in materials.

A. Macro

B. Semi-macro

C. Micro

D. Ultra-micro

C.

It describes the policies and procedures the laboratory has to manage in relation to quality, or references where those procedures can be found. An essential requirement of ISO 9000 series of standards and ISO 17025.

A. Quality Assurance

B. Quality Control

C. Quality Manual

D. Documentation

C.

It is a written program developed and implemented by the employer which sets forth procedures, equipment, PPE, and work practices that are capable of protecting employees from the health hazard presented by hazardous chemical used in the workplace.

A. Safety Manual

B. Chemical Hygiene Plan

C. Safety Rules and Policies

D. Safety Plan

B.

This type of method consists of a set of instructions about how to carry out a method issued by a national standards body and legislated by the national government to become mandatory.

A. Standard method

B. Regulatory method

C. Reference method

D. Validated method

B.

It is a hazardous waste characteristic which applies to waste liquids with a flash point less than 140 deg-C or solids capable of spontaneous combustion under normal T and P.

A. Ignitability

B. Reactivity

C. Corrosivity

D. Toxicity

A.

The following groups are known to be peroxide-forming compounds EXCEPT:

A. Ethers w/ primary and/or secondary alkyl groups;

B. Hydrocarbons w/ allylic, benzlic, or propargylic hydrogens;

C. Conjugated dienes, eneynes, and diynes; or

D. All are peroxide formers.

D.

What do you call a combination of two or more materials which retain their individual properties and can be separated by physical means?

A. solvents

B. reactions

C. mixtures

D. solutions

C.

As you move from top to bottom down the periodic table, ___________________.

A. change in atomic radius cannot be predicted

B. ionization energy increases

C. electronegativity decreases

D. atomic radius decreases

C.

What do you call an atom that has more protons than electrons?

A. an anion

B. none of the choices

C. a molecule

D. an isotope

B.

During the electroplating of silver, silver ions in solution _________________________.

A. are oxidized at the anode

B. are oxidized at the cathode

C. are reduced at the cathode

D. remain in solution unchanged

A.

A water sample is collected for analysis of oil and grease. The analysis will not be done immediately. The sample should NOT be:

A. collected in plastic bottle

B. preserved with sulfuric acid

C. refrigerated until analyzed

D. collected in all glass bottle

D.

When two materials that have different densities, like oil and water, encounter one another, they __________.

A. separate according to their densities

B. exchange densities

C. mix uniformly

D. repel one another

A.

The dynamic range in analytical measurement refers to the range where ______________________________.

A. the instrument reading is constant

B. the detection limit lies

C. the sensitivity of the instrument is highest

D. the instrument reading is linearly related to the input value

B.

What is the light source used in the visible range to 340-1000 nm?

A. nerst blower

B. tungsten

C. deuterium

D. incandescent

B.

Analytical methods or instruments' performance aim for ______________________.

A. Low signal-to-noise ratio

B. High variability

C. Low dynamic range

D. High signal-to-noise ratio

D.

A stable light source in AAS analysis, which is necessary to emit the sharp characteristic spectrum of the element to be determined is called _______________.

A. Tungsten lamp

B. Hollow cathode lamp

C. Deuterium lamp

D. Nerst blower

B.

The test that decides whether a datum from a given set could be rejected or NOT is:

A. T-test

B. Z-test

C. Q-test

D. F-test

C.