Quiz 14 Flashcards

1
Q
  1. If an analyte absorbs green, the color perceived is

red

blue

orange

violet

A

red

Within that wheel the colour an object appears to be is the colour complementary to the one it most strongly absorbs. As such, plants look green because they absorb red light most efficiently and the green light is reflected.

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2
Q
  1. Which of the following is not the characteristic of a reference electrode?

It must have a known output potential

It must have a constant output potential

Its output potential is dependent on the concentration of the solution

It is employed in conjunction with the indicator or working electrode

A

Its output potential is dependent on the concentration of the solution

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3
Q
  1. Which of the following is the purpose of added membrane in the glass membrane of the glass electrode?

They act as tighteners

They act as filters

They act as conditioners

They act as collectors

A

They act as tighteners

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4
Q
  1. Which of the following is not a failure in pH meters?

Defective electrodes

Defective input circuitry

Defective electronic circuitry

Defective calibration

A

Defective calibration

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5
Q
  1. When UV light is absorbed by the fluor molecules the light emitted is in which of the following colours?

pink

red

green

blue

A

blue

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6
Q
  1. Nuclear Magnetic Resonance (NMR) spectroscopy is used to determine structure in which of the following materials?

Radioactive materials

Insoluble chemical compounds

liquids

gases

A

liquids

NMR Spectroscopy is abbreviated as Nuclear Magnetic Resonance spectroscopy. Nuclear magnetic resonance (NMR) spectroscopy is the study of molecules by recording the interaction of radiofrequency (Rf) electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. An information-rich and non-destructive analytical tool, nuclear magnetic resonance (NMR) spectroscopy uses the inherent magnetic properties of specific atomic nuclei to reveal the structure, identity, concentration, and behavior of molecules in solid or liquid samples.

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7
Q
  1. Inductively Coupled Plasma (ICP) Spectroscopy’s principle is similar to which of the following?

Flame emission spectroscopy

Fourier transforms spectroscopy

Atomic emission spectroscopy

Absorption spectroscopy

A

Atomic emission spectroscopy

ICP (Inductively Coupled Plasma) Spectroscopy is an analytical method used to detect and measure elements to analyze chemical samples. What is ICP spectroscopy used for? Inductively coupled plasma mass spectrometry (ICP-MS) is an analytical technique that can be used to measure elements at trace levels in biological fluids.

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8
Q
  1. Which of the following is most often used in the chromatograph in GC-MS or Gas Chromatography - Mass Spectrometry?- Mass

curvette

paper support

capillary tube

flask

A

capillary tube

The GC works on the principle that a mixture will separate into individual substances when heated. The heated gases are carried through a column with an inert gas (such as helium). As the separated substances emerge from the column opening, they flow into the MS. What is the principle of gas chromatography and mass spectrometry? Gas chromatography mass spectrometry basic principles | Agilent It works by heating a liquid sample until it converts into a vapor that can be carried by a gas like helium or hydrogen. The gas (called a carrier gas or mobile phase) transports the sample through a long, thin glass or metal tube (column) that is coated with a chemical (stationary phase).

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9
Q
  1. Powerful analytical instrument but suitable for volatile chemicals only.

HPLC - High -Performance Liquid Chromatography

IR - Infrared Spectroscopy

GC - Gas Chromatography

NMR - Nuclear Magnetic Resonance

A

GC - Gas Chromatography

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10
Q
  1. What optimizes the precision of a calibration curve determination?

calibration and linear regression

environment

linear regression

method

A

calibration and linear regression

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11
Q
  1. It states that if a stress is applied to a system at equilibrium, the system will shift, if possible, in such a way as to reduce the stress.

Law of mass action

Le Chatelier’s principle

Rate law

Pauli exclusion principle

A

Le Chatelier’s principle

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12
Q
  1. In the reaction Na + Cl2 NaCl, what is the oxidizing agent?

NaCl

Cl

Na

Cl2

A

Cl2

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13
Q
  1. Choose the correct statement about a family of elements in the periodic table.

The atoms of all elements in a family have the same number of shells of electrons.

All elements in a family have the same physical state.

All elements in a family have the same chemical reactivity.

The atoms of all elements in a family have the same number of valence electrons.

A

The atoms of all elements in a family have the same number of valence electrons.

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14
Q
  1. The number that expresses the oxidation state of an atom of an element or groups of atoms is called the

indicator

valence

displacement factor

electrolyte

A

valence

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15
Q
  1. An uneven sharing of electrons between two atoms indicate

bonding

coupling

electronegativity

polarity

A

polarity

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16
Q
  1. The energy required to knock-off electrons from a neutral atom.

activation energy

ionization potential

transition energy

atomic energy

A

ionization potential

17
Q
  1. The temperature at which a substance starts to burn.

boiling point

kindling temperature

ignition point

combustion temperature

A

kindling temperature

18
Q
  1. According to Bronsted - Lowry theory, an acid is a substance that can

accept an electron pair

accept a proton

donate an electron pair

donate a proton

A

donate a proton

19
Q
  1. What law governs the rate of reaction of a substance?

conservation of mass

Arrhenius law

law of mass action

Avogadro’s law

A

law of mass action

20
Q
  1. In which colligative property (ies) does the value decrease as more solute is added?

boiling point

freezing point

osmotic pressure

freezing point & vapor pressure

A

freezing point & vapor pressure

21
Q
  1. In condensation polymerization, the most common molecule eliminated is

ammonia

carbon dioxide

methane

water

A

water

22
Q
  1. A superconductor

has zero resistance below some temperature

conducts heat very effectively at room temperature

has high electrical resistance

is unlikely to be a ceramic material

A

has zero resistance below some temperature

23
Q
  1. In which case are adhesive forces involved?

viscosity

surface tension

capillary action

thermal conductivity

A

capillary action

24
Q
  1. Which of the following is the most disordered?

gas near the condensation temperature

solid near the melting point

liquid near the freezing point

solid at very low temperature

A

gas near the condensation temperature

25
Q
  1. Which one of the following is not a characteristic of a liquid?

does not expand to fill the container

flows readily

is almost incompressible

diffusion within it occurs rapidly

A

diffusion within it occurs rapidly