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Orgchem Flashcards

1
Q

Methoxybenzene + HI with produce

A. Benzene + Methyl alcohol
B. Phenol + methyl iodide
C. Iodobenzene + methyl alcohol
D. Benzene + iodomethane

A

B

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2
Q

Molecules that have internal mirror planes are always

A. Chiral
B. Achiral
C. Meso
D. Racemic

A

Ans. Meso

Chiral= mirror images

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3
Q

Ch2I2 is _____ halide

A. Vicinal
B. Secondary
C. Geminal
D. Allylic

A

C

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4
Q

Which kf the ff will have the fastest sn2 rxn

A. CH3CH2Br
B. CH3CH2I
C. CH3CH2CI
D. CH3CH2F

A

B (most priority)

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5
Q

The reason that CH3NH2 is a stronger base than CH3OH is due to the fact that

A. Hyperconjugation resonance of the product, CH3NH3 is better than for CH3NH3+ is better than for CH3OH2
B. Resonance of the product, CH3NH3+ is better than for CH3OH2+
C. The electronegativity of nitrogen is less than oxygen, thus making the electron pair more available
D. It isn’t. The oxygen atom has 2 non-bonded pairs of electrons making it twice as basic

A

C

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6
Q

How many isomers do C5H12 have

A. 2
B 3
C. 4
D. 5

A

B

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7
Q

Which of the ff are limitations of Lambert-Beer’s Law?

a. Scattering of light due to particles b. Fluorescence of sample
c. Non-monochromatic radiation
d. All of the above

A

D

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8
Q

Which of the ff requires the most energy for electronic transition?

A. Alkyl halides
B. Alkanes
C. Carbonyl compounds
D. Carboxylic compounds

A

B

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9
Q

The process that combines alcohol and carboxylic acid to form an organic compound and water is called ____

A. Esterification
B. Mulification
C. Distillation
D. Etherification

A

A

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10
Q

When proteins are broken down by enzymes, the products are:

a. amino acids
b. carbohydrates
c. fatty acids
d. nucleic acids

A

A

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11
Q

Which compound will rapidly decolorize bromine in CHCl3

A. hexane
B. benzene
C. 1-hexene
D. cyclohexane

A

C

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12
Q

Which compounds have both cis and trans isomers possible?

Choices: Different organic compounds were given but you can choose which one is an alkene

A
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13
Q

Which plays a deciding role in the choice of solvents in lle process?

A. The dielectric constant D
B. Partition coefficient k
C. Both a and b
D. Neither a and b

A

C

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14
Q

Solvent extraction is more effective when the extraction is repeated with

A. Extra solvent
B. Large solvent
C. Small solvent
D both b and c

A

C

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15
Q

The process of heating a liquid mixture to form vapors and then cooling the vapors to get pure component is called

A. Crystallization
B. Distillation
C chromatography
D. Sublimation

A

B

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16
Q

Column chromatography is based on the principle of _______________
a) Ion-exchange
b) Exclusion principle
c) Differential adsorption
d) Absorption

A

C

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17
Q

Arrange the following compounds in order of their increasing adsorption tendencies.

a) Cellulose&raquo_space; starch&raquo_space; calcium carbonate&raquo_space; alumina
b) Cellulose&raquo_space; starch&raquo_space; alumina&raquo_space; charcoal
c) Charcoal&raquo_space; cellulose&raquo_space; alumina&raquo_space; starch
d) Calcium carbonate&raquo_space;; alumina&raquo_space; starch&raquo_space; cellulose

A

A

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18
Q

What is the factor responsible for the separation in column chromatography?

a) Polarity differences between the solvent
b) Polarity differences between the solute
c) Polarity indifference between the solvent
d) Polarity indifference between the solute

A

B

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19
Q

Select the correct statement from the following options.

a) The lesser the polarity of solute, more strongly it will be adsorbed on a polar surface
b) The greater the polarity of solute, more weakly it will be adsorbed on a polar surface
c) The greater the polarity of solute, more strongly it will be adsorbed on a polar surface
d) All of the mentioned option

A

C

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20
Q

The correct order of increasing strength of adsorption is ____________

a) Alkanes&raquo_space; Esters&raquo_space; Aldehydes&raquo_space; Phenols&raquo_space; Ketones
b) Aldehydes&raquo_space; Phenols&raquo_space; Ketones&raquo_space; Esters&raquo_space; Alkanes
c) Aldehydes&raquo_space; Ketones&raquo_space; Esters&raquo_space; Alkanes&raquo_space; Phenols
d) Alkanes&raquo_space; Esters&raquo_space; Ketones&raquo_space; Aldehydes&raquo_space; Phenols

A

D

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21
Q

The components of the mixture in column chromatography are eluted in order of ____________

a) Increasing polarity and decreasing distribution ratio
b) Increasing polarity and increasing distribution ratio
c) Decreasing polarity and increasing distribution ratio
d) Decreasing polarity and decreasing distribution ratio

A

B

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22
Q

The elution power of a solvent is determined by ____________
a) Its overall polarity
b) The polarity of the stationary phase
c) The nature of the sample components
d) All of the mentioned

A

D

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23
Q

Which of the following is separated through column chromatography?

a) Chlorophyll and carotenoids
b) Inorganic cations or complexes
c) Sugar derivatives
d) Amino acids formed by hydrolysis of a protein molecule

A

A

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24
Q

The mixture of petroleum ether and benzene is used in the elution ratio of ____________
a) 1 : 2
b) 1 : 5
c) 1 : 9
d) 1 : 12

A

C

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25
Q

Chloroform fraction is eluted from the column by passing chloroform through the column which acts as ____________

a) Eluter
b) Eluant
c) Elution
d) None of the mentioned option

A

C

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26
Q

Electrophiles are attracted to which of the following molecules

A. Both NH3 and NH4+
B. Both CH3O- and NH3
C. Both CH3O- and K +
D. NH3, NH4+, CH3O-, and K+

A

B

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27
Q

Nucleophiles are electron rich species or groups. Which of the following is an example of a nucleophile?
A. NH4+
B. H3O+
C. NH3
D. CH3OH

A

C

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28
Q

A base is defined by its ability to accept which of the following?

A. An electron
B. A free radical
C. A neutron
D. A proton

A

A

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29
Q

Which of the following statements is true concerning conformations of ethane?

A. The staggered conformation is the most stable.
B. The eclipsed form is the most stable.
C. The staggered and the eclipsed form have the same energy.
D. There are three stable staggered forms and two unstable eclipsed forms.

A

A

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30
Q

What is the reactivity order of halogens from most reactive to least reactive?

A. Cl, F, Br, I
B. Cl, Br, I, F
C. F, Cl, Br, I
D. I, Br, Cl, F

A

C

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31
Q

Which of the following is the most stable conformationof ethane?

A. Anti
B. Gauche
C. Eclipsed
D. Fully eclipsed

A

A

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32
Q

Complete the sentence. The SN2 mechanism is favored by all of the following, EXCEPT:

A. Primary alkyl halides
B. Nonpolar aprotic solvent
C. Tertiary alkyl halides
D. Less substituted alkyl halides

A

C

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33
Q

Fill in the blank. Compounds that have the same sequence of covalent bonds but differ in the relative position of the atoms in
space are

A. Constitutional isomers
B. Stereoisomers
C. Tautomers
D. Stable structural isomers

A

B

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34
Q

Which of the following statements about optically active compounds is false?

A. Racemates are not optically active.
B. Individual enantiomers are not optically active.
C. Achiral compounds are not optically active.
D. Meso compounds are not optically active.

A

B

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35
Q

Why are the functional carbons of organolithium and Grignard reagents effective as reducing agents?

A. Because they are basic and nucleophilic
B. Because they are basic and electrophilic
C. Because they are acidic and electrophilic
D. Because they are positively charged

A

A

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36
Q

Complete the sentences. Two degrees of unsaturation could be equivalent to all of the following EXCEPT

A. One ring and one double bond.
B. Two rings and one double bond.
C. Two rings.
D. One triple bond

A

B

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37
Q

In disubstituted alkenes, why are cis isomers less stable than trans isomers?

A. Because alkenes have pi bonds
B. Because of hyperconjugation
C. Because of steric hindrance
D. Because cis isomers typically do not react in reactions

A

C

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38
Q

Which of the following is NOT a step in the allylic bromination mechanism?

A. Propagation
B. Initiation
C. Bromine preparation
D. Termination

A

C

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39
Q

Which of the following statements about hydroboration reactions of alkenes is false?

A. The reaction is a one-step reaction.
B. The geometry of the reaction is syn.
C. It occurs via a carbocation intermediate.
D. It takes place with a retention of configuration.

A

C

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40
Q

At room temperature, alkenes can exist in which of the following phases?

A. Solids and liquids
B. Liquids and gases
C. Solids and gases
D. Solids, liquids, and gases

A

D

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41
Q

Alkynes are the most acidic hydrocarbon due to which of the following?

A. sp2 hybridation of the carbons
B. sp3 hybridation of the carbons
C. sp hybridation of the carbons
D. sp3 d hybridation of the carbons

A

C

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42
Q
  1. How many hydrogen atoms are in one molecule of propane?
    A. 4
    B. 3
    C. 6
    D. 8
A

C

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43
Q

How many different compounds have the formula C3H12?
A. 5
B. 2
C. 4
D. 3

A

D

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44
Q
  1. In which species is the carbon-nitrogen bond the shortest?

I CH3NH2
II CH2NH
III (CH3)4N^+
IV CH3CN

A. II
B. I
C. IV
D. II

A

C

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45
Q
  1. What is the hybridization of the carbon atom in a carboxyl group?

A. sp
B. sp^3
C. sp^2
D. dsp^3

A

C

46
Q

How many different alcohols have. the molecular formula CHI0?
A. 2
B. 4
C. 3
D. 5

A

B

47
Q

Which compound is expected to be most soluble in water at 25°C

A. N2
B. O2
C. (C2H5)2NH
D. C2H5OC2H5

A

D

48
Q

The gentle oxidation of ethanol, CH,CH,OH, produces_________
I ethanal, CH3CHO
II ethanoic acid, CH3CO2H
Ill carbon monoxide, CO
IV carbon dioxide, CO2

A.IV
B. I
C. II
D. III

A

B

49
Q

The ff compounds have very similar molar masses. What would be the correct order when they are arranged in order of increasing strength of their intermolecular forces

I. C3H8
II. CH3OCH3
III. CH3CH2OH

A. II<I<III
B. III<1<II
C. I<II<III
D. III<II<I

A

C

50
Q

A reaction in which a carboxylic acid reacts with an alcohol to form an organic compound and water is called_____
A. saponification
B. esterification
C. neutralization
D. hydrolysis

A

B

51
Q

Which class of compounds consists exclusively of saturated hydrocarbons?

A. alkenes
B. aromatics
C. alkynes
D. alkanes

A

D

52
Q

What is the position of the bromine atom relative to the methyl group in 3-bromotoluene?

A. meta
B. pera
C. Ortho
D. Trans

A

A

53
Q

The smell of rancud butter is due to the presence of butyric (butanoic) acid. What is the formula for this compound

I. C4H8O2
II. C4H10O
III. C5H10O2
III. C5H12O

A. IV
B. II
C. III
D I

A

D

54
Q

Which combination of reactants produces an ester?

A. aldehyde and potassium permanganate
B. acid and alcohol
C. acid and aldehyde
D. alcohol and aldehyde

A

B

55
Q

In crystallization, the solution which is obtained after filtration is the _____

A. clear solution
B. colloidal solution
C. suspended solution
D. None of the given answers

A

A

56
Q

In crystallizalion, the crystal phases can be inter-converted by varying

A. temperature
B. pressure
C. viscosity
D. size

A

A

57
Q

Which separation technique is based on differences in the volatility of the compounds to be separated?

A. solvent extraction
B. distillation
C. paper chromatography
D. filtration

A

B

58
Q

Fractional distillation is different from distillation because of the presence of a ____

A. Fractionating column
B. Condenser
C. Conical flask
D. Distillation

A

A

59
Q

The process of heating a liquid mixture to form vapors and then cooling the vapors to get a pure component is called.

A. Distillation
B. Chromatography
C. Crystallization
D. Sublimation

A

A

60
Q

A common measure of efficiency in a fractionating column is the

A. length of the condenser used In the setup
B. number of distillation types
C. number of components in the solution
D. number of theoretical plates in the column

A

D

61
Q

Five grams of an organic solid was dissolved in 100 mL of distilled water. Which of the following extraction methods can remove the largest amount of organic solid from an aqueous solution?

A. Extract the aqueous solution with a 150-mL portion of ether.
B. Extract the aqueous solution with three 50-mL portions of ether.
C. Extract the aqueous solution with a 150-mL portion of acetic acid.
D. Extract the aqueous solution with three 50-mL portions of acetic acid.

A

B

62
Q

Which of the following funnels should be used to filter hot mother liquor during recrystallization?

A Buchner funnel
B. Hirsch funnel
C. Long stem funnel
D. Short stem funnel

A

B or d

63
Q

What is the key step in a recrystallization process?

A. Taking the melting point of wet crystals
B. Dissolving the sold in a large quantity of cold solvent
C. Allowing the hot solution to cool slowly and let crystals grow
D. Removing the soluble impurites by vacuum filtration

A

C

64
Q

Which of the following is the example of crystallisation process?

A. Purification of alum
B. None of the given answers
C. Separation of gases from air
D. Purification of sea water

A

A

65
Q

A constant boiling mixture of two or more components in a solution is called a/an

A. azeotrope
B. ideal solution
C. non-ideal solution
D. eutectic mixture

A

A

66
Q

A compound is known to decompose at its boiling point. Which of the following methods can used to purify the substance?

A. Steam distillation
B. Fractional distillation
C. Liquid-liquid extraction
D. Vacuum distillation

A

D

67
Q

When the solid and liquid phases are In equilibrium, the temperature of the system

A.decreases gradually
B. none of the given answers
C.increases gradually
D. remains constant

A

D

68
Q

Which is the INCORRECT statement among the following?

A. An impure sample of the substance has a different melting point.
B.Two different pure substances have the same melting points.
C. Melting point serves as the criterion of purity of a solid subslance.
D.Every pure solid crystalline substance has a characteristic and unique melting point.

A

B

69
Q

The boiling point of a liquid is the temperature at which the vapor pressure is

A.lesser than internal pressure
B. equal to internal pressure
C. equal to external pressure
D. greater than internal pressure

A

B

70
Q

Which of the following statements is correct?

A. Solid reactants can be weighed directly in the weighing pan of the analytical balance.
B. Weight of liquids is approximately equal to Its density.
C. Solid reactants can be transferred to a reaction flask by using a metal spatula.
D. Volatile liquids can be weighed by getting the mass of the empty vial with cap first.

A

D

71
Q

A reaction mixture needs to be cooled to -77°C after refluxing. What is the best method to be used?

A. Place the reaction vessel in an ice bath.
B. Place the reaction vessel in the freezer.
C. Place the reaction vessel In a salt and crushed ice mixture.
D. Place the reaction mixture in a dry ice-acetone mixture.

A

D

72
Q

Which of the following reactions will consume the most oxygon?

A. complete combustion of one mole of octano
B. complete combustion of one mole of 2,3-dimethylhexane
C. complete combustion of one mole of 2,3,4-trimethylpentane
D. All the given compounds will consume the same amount of oxygen.

A

D

73
Q

Which of the following techniques can be used to heat a reaction to 200°C?

A. Use a Bunsen burner to heat the reaction vessel.
B. Use & heating mantle with stirring.
C. Place the reaction vessel in a sand bath with stirring.
D. Place he reaction vessel in a water bath with stirring.

A

A or c

74
Q

When proteins are broken down by enzymes, the products are.

A. amino acids
B. fatty acids
C. nucleic acids
D. carbohydrates

A

A

75
Q

Which alkyl hallde will most likely undergo Sn2 mechanism?

A. 2-bromobutane
B. bromomethane
C. : 2-bromo-2-methylpropane
D. 1-bromobutane

A

B

76
Q

Which alkyl hallde will most likely undergo Sn2 mechanism?

A. 2-bromobutane
B. bromomethane
C. : 2-bromo-2-methylpropane
D. 1-bromobutane

A

B

77
Q

Aldehydes and ketones generally react by ______

A.nucleophilic substitution
B. nuceophilic addition
C. electrophilic addition
D. electrophilic substitution

A

B

78
Q

AlCI3 is a catalyst used in the alkylation of aromatic compounds. It is a ______

A. a Lewis acid
C. an Arrhenius acid
B. a Lowry-Bronsted acid
D. a Lewis base

A

A

79
Q

An industrial source of aicohol is

A.Fats
B. Coal
C. Sugar
D. Ethers

A

C

80
Q

The reaction rate is defined as the rate at which the concentration of the reactants time or the rate at which the concentration of products.
with time.

A. decrease, decrease
B. increase, increase
C. decrease, increase
D. increase, decrease

A

C

81
Q

Hydrogeration of an alkene yields

A. alcohol
B. aldehyde
C. alkane
D. alkyne

A

C

82
Q

Which of the following is produced when hydrogen is reacted with 2-butanone?

A. tertiary alcohol
B. aldehyde
C. Primary alcohol
D. Secondary alcohol

A

D

83
Q

Which of the following reactions are favored by polar aprotic solvent?

A. Both SN1 and SN2 reactions
B. SN1 reactions
C. None of the given choices
D. SN2 reactions

A

D

84
Q

Benzene and its derivatives undergo substitution reactions instead of addition reactions because

A. the integrity of the benzene ring and the stable pi-bonding patter remains intact
B. the benzene ring is sterically crowded, hence, only substitution can occur
C. the hydrogens of benzene are relatively loosely bound
D. the benzene ring is electron rich

A

A

85
Q

Quantitative analysis of compounds can be done using _____

A. lon exchange chromatography
B. Liquid chromatography
C. Gas chromatography
D. Thin layer chromatography

A

C

86
Q

A mobile phase can be classified as

I Solid
II Liquid
Ill Gas

A. Il only
c. Il and Ill only
B. Ill only
D. l only

A

C

87
Q

The lon exchange resin with a functional group of HSO, exchanges ions with .

A. Small cations and anions
B. Cations
C. Large cations and anions
D. Anions

A

B

88
Q

In thin layer chromatography, the solvent or mobile phase contained in a closed chamber is a mixture of

A. a liquid and a gas
C. solids
B. liquids
D. gases

A

B

89
Q

The chromaplate or thin layer chromatography plate is made up of

A. Wood
B. Fibre
C. Metal
D. Glass

A

D

90
Q

Affinity chromatography is used for the analysis and isolation of_____

A. All of the given answers
B.Insoluble starch substances
C.Enzyme tyrosinase
D. Antibodies bound with a covalently-attached antigen on cellulose column

A

A

91
Q

Retardation factor is the ratio of

A. Distance moved by solvent from base line to distance moved by the substance from base line
B. Distance moved by substance from base line to distance moved by the solvent from base line
C.Distance moved by solvent from top line to distance moved by the substance from top line
D. Distance moved by substance from top line to distance moved by the solvent from top line

A

B

92
Q

Gas-solld chromalography is _______ chromatography as per basic principle involved.
A. Absorption
C. lon-exchange
B. Adsorption
D. Exclusion

A

B

93
Q

In chromatography, the relative solublily of solute in both the phasos determines the

A. Rate of disappearance of solute
B. Rate of movement of solvent
C. Rate of disappearance of solvent
D.Rate of movement of solute

A

D

94
Q

Which of the following chromatographic methods is most suitable for the analysis of high molecular weight compounds that are soluble in non-polar solvents?

A. gas- liquid
B. gel filtration
C. ion-exchange
D. gel permeation

A

D

95
Q

In thin layer chromatography, the relative adsorption of each components of the mixture is expressed In terms of its.

A. Retardation factor
B. Solubility factor
C. Acceleration factor
D. Both acceleration and retardation factor

A

A

96
Q

Column chromatography is based on the principle of _

A. lon-exchange
B. Differential adsorption
C. Absorption
D. Exclusion principle

A

B

97
Q

The components of the mixture in column chromatography are eluted in order of

A. Increasing polarity and decreasing distribution ratio
B. Decreasing polarity and increasing distribution ratio
C. Increasing polarity and increasing distribution ratio
D. Decreasing polarity and decreasing distribution ratio

A

C

98
Q
  1. Benzene has a smaller distribution ratio, D, in squalene than cyclohexane.
    Squalene is a aliphatic type of hydrocarbon. What is the order of elution of the two compounds from the GC column?

D=[concentration of sample in stationary phase]/[concentration of sampie in mobile phase]

A. Benzene will be aluted first.
B. Cyciohexane will be eluted first.
C.The order of elution cannot be determined.
D. The two peaks will overlap.

A

A

99
Q

The elution power of a solvent is determined by

A. Its overall polarity
B. The polarity of the stationary phase
C. All of the given answers
D. The nature of the sample components

A

C

100
Q

What is the wavelength range for UV spectrum of light?

A. 400 nm - 700 nm
B. 10 nm to 400 nm
C. 700 nm to 1 mm
D. 0.01 nm lo 10 nm

A

B

101
Q

Which is the correct statement from the following?

A. Molecular spectra is more complicated than atomic spectra
B. Molecular spectra arises from the transition of an electron between the molecular energy levels
C. In molecular transitions, electronic, rotational and vibration transitions occurs
D. All of the given choices

A

D

102
Q

The different types of energies assocated with a molecule are.

A. Electronic energy
B. Rotational energy
C. All of the given answers
D. Vibrational energy

A

C

103
Q

Alcohol and other are often used as solvents. What is the disadvantage of using these compoundo to dissolve analytes for epectroscopic analysis in the UV-visible region?

A. They react with the analyte given the energy at this region.
B. There solvents prevent the analyte from absorbing light.
C. They also absorb light at the UV-visible region.
D. They interfere in the transition of the electrons of the analyle.

A

D unsure

104
Q

Which of the following is an application of electronic spectroscopy?

A. Study of kinetiss of chemical reaction
B. Control of purification
C. All of the given answers
D. Detection of impurities

A

C

105
Q

Which of the following is a NOT a characterisic of chromophores?
A. May contain extensive conjugated double bonds
B. Contains unsaturated functional group
C. Added to ions that do nol strongly absorb light in the UV-visible region
D. Absorbs strongly at 800 nm

A

D

106
Q

Which of the following is an application of molecular spectroscopy?

A. All of the given answers
B. Basis of understanding of colors
C. Structural investigation
D. Study of energetically excited reaction products

A

A

107
Q

A compound with a formula of C7H14O exhibits an IR peak et 1715 cm-1. The compound may be a/an
A. ketone
C. ester
B. ether
D. alcohol

A

A

108
Q

At which region can be found the peaks due to N - H, C - H and O - H stretching and bending motions?

A. 2600 to 2000 cm-1
C. 4000 to 2500 cm-1
B. 1500 to 1000 cm-1
D. 2000 to 1500 cm-1

A

C

109
Q

Hazardous wastes by definition may be all of the following EXCEPT
A. Explosive
B. Toxic
C. Corrosive
D. Reactive

A

A

110
Q

Which treatment of wastes can be done in situ?

A. Air stripping
C. All of the given answers
B. Chemical degradation
D. Biodegradation

A

C

111
Q

Which treatment method is NOT typically used to remove organic compounds?

A. Thermal
B. Biological
C. Physical
D. Chemical

A

C

112
Q

The following are requirements for hazardous waste storage EXCEPT _

A. The floors should be impermeable to liquids and resistant to attack by chemicals.
B. Drums should be preferably stored upright or pallets and stacked no more than four drums high.
C. The facility should be enclosed but ventilated.
D. The facily should ba properly secured and ca be easily accessed by anyone

A

C or d

Chem Tech (2 decks)

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