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Chem Tech > Additional Questions ChT > Flashcards

Additional Questions ChT Flashcards

1
Q

Which of the following is not a common method used for purification?
a) Sublimation
b) Crystallisation
c) Electrolysis
d) Chromatography

A

c. Electrolysis

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2
Q

Crystallization is based on the

A

Difference in solubility

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3
Q

Which of the following is the example of crystallisation process?
a) Purification of alum
b) Purification of sea water
c) Separation of gases from air
d) None of the mentioned

A

a) Purification of alum

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4
Q

At room temperature, the impure compound in crystallization is

A

Sparingly soluble

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5
Q

Which of the following is known as mother liquor

A

Filtrate

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6
Q

The solution of impure compound and solvent is concentrated to get

A

Saturated solution

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7
Q

Insoluble impurities from solution during crystallization are removed by

A

Filtration

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8
Q

The solution which is obtained after filtration is

A

Clear solution

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9
Q

Crystal phases can be inter-converted by varying

A

Temperature

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10
Q

The nature of the crystallization process is governed by

A

Thermodynamics and Kinetic factors

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11
Q

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

A

Distillation

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12
Q

Porcelain pieces are put into the distillation flask to avoid

A

Bumping of the solution

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13
Q

The boiling point of chloroform is

A

334 K

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14
Q

The boiling point of aniline is

A

457 K

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15
Q

How aniline and chloroform can be separated?

A

Distillation

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16
Q

Which of the following is not separated through distillation process?
a) Acetone and water
b) Aniline and chloroform
c) Impurities in Sea water
d) Milk and water

A

d. Milk and water

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17
Q

Which of the following will vaporize faster?
a) Aniline
b) Chloroform
c) Water
d) Kerosene

A

b) Chloroform

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18
Q

The distilled water is collected in

A

Receiver

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19
Q

The process of distillation is used for the liquids having

A

Sufficient difference in their boiling point

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20
Q

(Distillation) The residue in the round bottom flask is

A

Non volatile

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21
Q

Fractional distillation is a process of separation of

A

2 miscible liquids

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22
Q

The difference in boiling point of 2 liquids in fractional distillation is

A

less than 25 K

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23
Q

(Fractional distillation) A simple fractional tube is packed with

A

Glass beads

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24
Q

Fractional distillation is different from distillation because of the presence of

A

Fractionating column

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25
Q

The beads are provided in fractional column for

A

Vapours to condense

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26
Q

Select the INCORRECT statement from the following options.
a) Fractionating columns are available in various design and size
b) Fractionating columns are available according to one fixed standard
c) A simple fractionating column is a tube packed with glass beads
d) Fractional distillation is the process of separation of different gases from air

A

b) Fractionating columns are available according to one fixed standard

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27
Q

Which of the following gases cannot be separated from air using fractional distillation?
a) Argon
b) Oxygen
c) Helium
d) Nitrogen

A

c) Helium

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28
Q

(Fractional distillation) Initially, the temperature at the top of the column is _______________ than at its bottom.

A

Lesser

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29
Q

Which of the following is more suitable for fractional distillation process?
a) Oil bath
b) Water bath
c) Glycerine bath
d) None of the mentioned

A

Oil bath

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30
Q

Number of steps required for the separation of two liquids in fractional distillation is

A

2

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31
Q

In steam distillation, the liquid boils when the sum of vapour pressure due to organic liquid and due to water becomes

A

Equals to atmospheric pressure

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32
Q

The organic liquid in steam distillation vaporizes at

A

Lower temperature than its boiling point

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33
Q

Steam distillation process is used to separate substances which are

A

Steam volatile and immiscible with water

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34
Q

What type of mixture is collected in round bottom flask after passing through a steam generator?

A

Mixture of volatile organic compound and steam

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35
Q

Which of the following property is NOT possessed by the organic solvent required to separate organic compound with water?
a) It is immiscible with water
b) It is less volatile than water
c) It is easily vaporisable
d) Organic compound is more soluble in it

A

It is less volatile than water

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36
Q

Which of the following is the upper layer in differential extraction?
a) Solvent layer
b) Solute layer
c) Aqueous layer
d) None of the mentioned

A

Solvent layer

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37
Q

When does the organic compound be present in the upper solvent layer in differential extraction?

A

After the extraction

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38
Q

The organic compound in differential extraction is recovered from the organic solvent by

A

Distillation

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39
Q

The pure solvent after the differential extraction cannot be used again for the extraction.

A

FALSE

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40
Q

Aniline is separated from aniline-water mixture using

A

Steam distillation

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41
Q

Chromatography is the process for identification, purification and separation of components of a mixture on the basis of

A

Difference in their affinity for mobile and stationary phase

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42
Q

Chromatography involves two mutually

A

Immiscible phases

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43
Q

(Chromatography) There is no need of support if packed into a column when the stationary phase is

A

Solid

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44
Q

Which of the following is not a stationary phase?
a) Liquid-liquid chromatography
b) Gas-liquid chromatography
c) Gas-solid chromatography
d) Solid-solid chromatography

A

d) Solid-solid chromatography

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45
Q

Liquid chromatography is a technique for separating

A

Ions that are dissolved in a solvent

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46
Q

In exclusion chromatography, solute molecules are separated based on

A

Molecular geometry and size

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47
Q

The gas-solid chromatography is ______________ chromatography as per basic principle involved.

A

Adsorption

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48
Q

(Chromatography) A proper solvent that is passed through the column for elution so that separated components can be collected is called

A

Buffer solution

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49
Q

(Chromatography) The relative solubility of solute in both the phases determines the

A

Rate of movement of solute

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50
Q

(Chromatography) If the mobile phase is gas, movement of solute is determined by its

A

Volatility

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51
Q

Column chromatography is based on the principle of

A

Differential adsorption

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52
Q

(Column chromatography) Arrange the following compounds in order of their increasing adsorption tendencies

A

Cellulose&raquo_space; starch&raquo_space; calcium carbonate&raquo_space; alumina

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53
Q

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

A

Polarity differences between the solute

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54
Q

(Column chromatography) 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) The greater the polarity of solute, more strongly it will be adsorbed on a polar surface

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55
Q

(Column Chromatography) The correct order of increasing strength of adsorption is

A

Alkanes&raquo_space; Esters&raquo_space; Ketones&raquo_space; Aldehydes&raquo_space; Phenols

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56
Q

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

A

Increasing polarity and increasing distribution ratio

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57
Q

(Column chromatography) 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) All of the mentioned

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58
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) Chlorophyll and carotenoids

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59
Q

(Column chromatography) 9. The mixture of petroleum ether and benzene is used in the elution ratio of

A

01:09

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60
Q

(Column chromatography) Chloroform fraction is eluted from the column by passing chloroform through the column which acts as

A

Elution

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61
Q

The principle on which thin layer chromatography is based is that the

A

Different compounds are adsorbed on an adsorbent to different degrees

62
Q

(Thin layer chromatography) The size of a thin layer of adsorbent is about

A

0.2 mm

63
Q

The chromaplate or thin layer chromatography plate is made up of

A

Glass

64
Q

(Thin layer chromatography) The eluant filled in the closed jar is

A

Mixture of liquids

65
Q

(Thin layer chromatography) Select the incorrect statement from the following options.
a) The spots of colorless compounds are invisible to the eyes
b) These spots can be detected by putting the plate under ultraviolet light
c) These spots can be detected by placing the plate in a covered jar containing iodine crystals
d) None of the mentioned

A

d) None of the mentioned

66
Q

(Thin layer chromatography) The relative adsorption of each component of the mixture is expressed in terms of its

A

Retardation factor

67
Q

(Thin layer chromatography) Select the correct statement from the following.
a) Paper chromatography is a type of partition chromatography
b) A special quality paper is used in paper chromatography
c) Chromatography paper contains water trapped in it, which acts as stationary phase
d) All of the mentioned

A

All of the above

68
Q

(Thin layer chromatography) Amino acids detected by spraying the plate with ninhydrin solution is an example of

A

Paper chromatography

69
Q

Paper chromatography is based on continuous differential partitioning of components of a mixture between stationary and mobile phases.

A

TRUE

70
Q

(Thin layer chromatography) Retardation factor is the ratio of

A

Distance moved by substance from base line to distance moved by the solvent from base line

71
Q

What are the uses of partition chromatography?
a) Separation of amino acids
b) Analysis of closely related aliphatic alcohols
c) Separation of sugar derivatives
d) All of the mentioned

A

All of the mentioned

72
Q

Which type of chromatography is used for the structural analysis?

A

Paper chromatography

73
Q

Which of the following is not done using column chromatography?
a) The identification of unknown compounds
b) The determination of homogeneity of chemical substances
c) Separation of inorganic cations or complexes
d) Separation of geometric isomers

A

Separation of inorganic cations or complexes

74
Q

Affinity chromatography is used for the analysis and isolation of ____________
a) Insoluble starch substances
b) Enzyme tyrosinase
c) Antibodies bound with a covalently-attached antigen on cellulose column
d) All of the mentioned

A

d) All of the mentioned

75
Q

Purification of enzymes and proteins is done using

A

Affinity chromatography

76
Q

Which of the following is not an application of high performance liquid chromatography?
a) Analysis of proteins, drugs and explosives
b) Separation of pharmaceutical drugs
c) Elimination of undesirable substances from blood
d) Separation of lipids, fatty acids and steroids

A

c) Elimination of undesirable substances from blood

77
Q

The checking of purity of samples is the application of thin layer chromatography.

A

TRUE

78
Q

The analysis and separation of industrial products like soap and synthetic detergents is done using

A

Gas chromatography

79
Q

Which of the following is the application of ion exchange chromatography?
a) The softening of hard water
b) The demineralisation of water
c) The separation and determination of anions
d) All of the mentioned

A

d) All of the mentioned

80
Q

The quantitative analysis is done using

A

Gas chromatography

81
Q

The purity of the compound is confirmed by ____________
a) Its melting point and boiling point
b) Chromatographic technique
c) Spectroscopy
d) All of the mentioned

A

All of the mentioned

82
Q

Select the correct statement from the following options.
a) The transformation of solid to liquid is called melting and the reverse process is called freezing
b) The transformation of solid to liquid is called freezing and the reverse process is called melting
c) The transformation of liquid to solid is called melting and the reverse process is called freezing
d) None of the mentioned

A

The transformation of solid to liquid is called melting and the reverse process is called freezing

83
Q

The temperature at which solid and liquid coexist in equilibrium is called

A

Freezing point of liquid

84
Q

Select the incorrect statement from the following option.
a) Every pure solid crystalline substance has a characteristic and unique melting point
b) Impure sample of substance has different melting point
c) Two different pure substances have same melting points
d) Melting point serves as the criteria of purity of a solid substance

A

Two different pure substances have same melting points

85
Q

When the solid and liquid phase are in equilibrium, the temperature

A

Remains constant

86
Q

The melting point of ice is

A

0 deg C

87
Q

Molar heat of fusion is defined as

A

Energy required to melt one mole of solid

88
Q

The temperature remains constant during phase change because the increased kinetic energy is used to overcome the cohesive forces in the liquid.

A

TRUE

89
Q

What is the molar heat of fusion (kJ/mol) of water?

A

6.01

90
Q

What is the melting point of mercury?

A

b) -39 deg C

91
Q

On increasing the temperature of a liquid, its vapour pressure

A

Increases

92
Q

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

A

Is equal to the external pressure

93
Q

The normal boiling point of a liquid is the temperature at which it boils when the external pressure is

A

1 atm

94
Q

If the non-volatile impurities contaminate the liquid, its boiling point gets

A

Elevated

95
Q

The energy required to vaporize 1 mole of a liquid is known as

A

Molar heat of vaporization

96
Q

At 1 atm pressure, the boiling point of water is

A

100 deg C

97
Q

The boiling point and molar heat of vaporisation is dependent on

A

Strength of the inter-molecular forces

98
Q

Select the incorrect statement from the following options
a) Methane and argon have weak dispersion forces so their boiling point is low
b) Diethyl ether has a dipole moment, and the dipole-dipole forces account for its moderately high boiling point
c) Water and ethanol have strong hydrogen bonding and hence they possess high boiling point
d) Mercury has weak metallic bonding which is responsible for its low boiling point

A

d) Mercury has weak metallic bonding which is responsible for its low boiling point

99
Q

For a given substance, choose the correct statement

A

Hfus is smaller than Hvap

100
Q

The molar heat of vaporisation (Hvap) for water is

A

40.79 kJ/mol

101
Q

The analysis of electromagnetic radiation scattered, absorbed or emitted by the molecule is called

A

Spectroscopy

102
Q

The energy level with lower energy is called

A

Ground state energy level

103
Q

Absorption spectrum results when an electron in an atom undergoes a transition from

A

Lower energy level to a higher one

104
Q

The energy of a photon is given by

A

hv

105
Q

Select the INCORRECT statement from the following option.
a) Emission spectrum results when an electron in an atom undergoes a transition from excited state to the ground state
b) In the emission spectrum, transition takes place with the emission of a photon of energy h?
c) In the emission spectrum, transition takes place with the absorption of a photon of energy h?
d) All of the mentioned

A

c) In the emission spectrum, transition takes place with the absorption of a photon of energy h?

106
Q

The spectra can be broadly classified into two categories. They are

A

Atomic and molecular spectra

107
Q

In atomic spectroscopy, only electronic transitions are involved.

A

TRUE

108
Q

Select the correct statement from the following options.
a) Molecular spectra arises from the transition of an electron between the molecular energy levels
b) In molecular transitions, electronic, rotational and vibration transitions occurs
c) Molecular spectra is more complicated than atomic spectra
d) All of the mentioned

A

All of the mentioned

109
Q

The necessary condition for absorption spectrum is that

A

hv should be equal to the energy difference

110
Q

Spectroscopy deals with the transition that a molecule undergoes on the absorption of suitable radiations determined by quantum mechanical selection rules.

A

TRUE

111
Q

(Molecular Spectroscopy) The different types of energies associated with a molecule are __________
a) Electronic energy
b) Vibrational energy
c) Rotational energy
d) All of the mentioned

A

All of the mentioned

112
Q

(Molecular Spectroscopy) During the motion, if the center of gravity of molecule changes, the molecule possess ________.

A

Translational Energy

113
Q

The correct order of different types of energies is

A

E el&raquo_space; E vib&raquo_space; E rot&raquo_space; E tr

114
Q

The region of electromagnetic spectrum for nuclear magnetic resonance is

A

Radio frequency

115
Q

Which of the following is an application of molecular spectroscopy?
a) Structural investigation
b) Basis of understanding of colors
c) Study of energetically excited reaction products
d) All of the mentioned

A

All of the mentioned

116
Q

Select the CORRECT statement from the following option.
a) Spectroscopic methods require less time and more amount of sample than classical methods
b) Spectroscopic methods require more time and more amount of sample than classical methods
c) Spectroscopic methods require less time and less amount of sample than classical methods
d) Spectroscopic methods require more time and less amount of sample than classical methods

A

c) Spectroscopic methods require less time and less amount of sample than classical methods

117
Q

The results obtained by spectroscopic methods are less reliable, less reproducible and incorrect than classical methods.

A

FALSE

118
Q

The transition zone for Raman spectra is

A

Between vibrational and rotational levels

119
Q

The criteria for electronic spin resonance is

A

Presence of unpaired electron in a molecule

120
Q

Sample recovery is possible after spectroscopic analysis because the sample is not chemically affected.

A

TRUE

121
Q

(Electronic Spectroscopy) The electronic spectra in the visible range span is

A

12500-25000 cm-1

122
Q

(Electronic spectroscopy) Which of the following transitions are of weak intensities and lie in the visible region? Note: o is sigma a) n –> n* b) o –> o* c) pi –> pi* d) n –> o*

A

a) n –> n*

123
Q

(Electronic spectroscopy) Arrange the various electronic transitions in the order of increasing energy.

A

n –> pi* < pi –> pi* < n –> o* < o –> o*

124
Q

(Electronic spectroscopy) What is the position of the band of alkanes?

A

150 nm

125
Q

(Electronic spectroscopy) Which of the following organic compound shows transition due to conjugation?

A

Conjugated dienes

126
Q

Which of the following is not an auxochrome group? a) -OH b) -SH c) -OR d) -O2

A

d) -O2

127
Q

Which of the following shift leads to the decreased intensity of absorption?

A

Hypochromic

128
Q

Which of the following is an application of electronic spectroscopy?
a) Detection of impurities
b) Control of purification
c) Study of kinetics of the chemical reaction
d) All of the mentioned

A

All of the mentioned

129
Q

What will be the absorbance if percent T = 80?

A

0.097

130
Q

Which of the following is a limitation of the Lambert-Beer’s law?
a) Scattering of light due to particles
b) Fluorescence of sample
c) Non-monochromatic radiation
d) All of the mentioned

A

All of the mentioned

131
Q

Vibrational spectroscopy involves the transitions falling in the spectral range of

A

400-4000 cm-1

132
Q

Which of the region of IR spectra appears between (1400-600) cm-1?

A

Fingerprint region

133
Q

Select the CORRECT statement from the following option.
a) Infrared spectra can identify the unknown materials
b) It can determine the amount of components in a mixture
c) It can also determine the quality of a sample
d) All of the mentioned

A

All of the mentioned

134
Q

Which of the following molecule have infrared active vibrations?
a) NO
b) CH4
c) H2
d) All of the mentioned

A

a) NO

135
Q

Which of the following cannot show a vibrational absorption spectrum?
a) OCS
b) H2O
c) CO2
d) CH2 = CH2

A

d) CH2 = CH2

136
Q

Which of the following is NOT a type of bending molecular vibration?
a) Twisting
b) Stretching
c) Wagging
d) Rocking

A

Stretching

137
Q

What is the absorption frequency(cm-1) of -C=N functional group?

A

1180-1360

138
Q

Presence of a functional group in a compound can be established by using

A

IR spectroscopy

139
Q

Select the incorrect option from the following option.
a) IR spectroscopy helps in the determination of purity
b) IR spectroscopy helps in the determination of force constant from vibrational spectrum
c) IR spectroscopy helps in identifying an unknown compound
d) None of the mentioned

A

None of the mentioned

140
Q

IR spectroscopy helps in detecting the presence of hydrogen bonding.

A

TRUE

141
Q

(Nuclear Magnetic resonance) The nuclei with a spin quantum number greater than _______ can exhibit the NMR phenomenon.

A

0 (zero)

142
Q

(NMR) The number of different orientations which a magnetic nucleus can take is

A

2l + 1

143
Q

Number of NMR signals obtained in CH3COCH3 will be

A

1

144
Q

Propene as well as 2-Butene(cis) will show equal number of signals in their NMR spectra.

A

FALSE

145
Q

Select the INCORRECT statement from the following option.
a) TMS stands for tetra methyl silane
b) All the hydrogen in TMS have the same chemical shift
c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample
d) TMS is relatively unreactive with most functional groups

A

c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample

146
Q

The NMR spectra of the functional isomers of the molecular formula C2H6O show _____ and _____ signals respectively.

A

1, 3

147
Q

(NMR) The number of signals in 1-propanol are ____ while those in 2-propanol are ____.

A

4, 3

148
Q

For NMR spectrum, carbon tetrachloride and water can be successfully used as a solvent.

A

TRUE

149
Q

(NMR) In how many ways -CH3 protons can couple with the protons on adjacent carbon atom relative to the external field.

A

4

150
Q

(NMR) Which of the following is inversely proportional to the chemical shifts positions (delta lower case)?
a) Frequency of unknown group of protons
b) Frequency of TMS
c) Operating frequency of the instrument
d) All of the mentioned

A

c) Operating frequency of the instrument

Chem Tech (1 decks)

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