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Principles Related to Practical Chemistry Flashcards

1
Q

Alcohols react with Cerric ammonium nitrate to give

A

A Red Complex [Ce(NO3)4(ROH)3]

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2
Q

Phenol with Neutral Ferric Chloride gives

A

Violet Colour
[Fe(OC6H5)6]3-

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3
Q

Resorcinol with Neutral Ferric Chloride gives

A

Blue/Violet Colour

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4
Q

o-,m-&p- cresols with Neautral Ferric Chloride gives

A

Blue/Violet Colour

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5
Q

Catechol with Neutral Ferric Chloride gives

A

Green which rapidly darkens

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6
Q

1-Naphtol & 2-Naphtol with Neautral Ferric Chlorde gives

A

No Colour

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7
Q

Phenol with Phtalein Dye gives

A

Pink Colour

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8
Q

o-Cresol with Phtalein Dye gives

A

Red Colour

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9
Q

m-Cresol with Phtalein Dye gives

A

Bluish-Purple Colour

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10
Q

p-Cresol with Phtalein Dye gives

A

No Colour

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11
Q

Catechol with Phtalein Dye gives

A

Usually blue, takes longer time to appear

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12
Q

Resorcinol with Phtalein Dye gives

A

Green fluorescent colour of Fluorescein

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13
Q

Carbonyl Compounds with 2,4-DNP gives

A

Orange/Red/Yellow Crystals

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14
Q

Why is Benedit Solution preferred over Fehlings Solution?

A

Benedict Solution is Stable while Fehling’s Solution is unstable
[Fehling’s Solution A & Fehling’s Solution B are stable independently]

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15
Q

BiCarbonate Test liberates CO2 with:

A

Sulphonic Acid
Carboxylic Acid
Picric Acid
2,4-DiNitroPhenol

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16
Q

Universal Test for Primary Amine is

A

Carbylamine/Isocyanide Test

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17
Q

Primary Amine is ___ in Conc. HCl

A

Soluble

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18
Q

Test for distinguishing between Aliphatic Primary Amine and Aromatic Primary Amine

A

Azo Dye test

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19
Q

Azo Dye Test of Aromatic Primary Amine gives

A

Scarlet Red Dye

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20
Q

During Preparation of Mohr Salt, dil. H2SO4 is added to:

A

Prevent Hydroysis of Fe2+ to Fe(OH)2

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21
Q

During preparation of Mohr Salt, strong heating is avoided to

A

Prevent Oxidation of Fe2+ to Fe3+

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22
Q

Formula for Mohr’s Salt

A

[FeSO4.(NH4)2SO4.6H2O]

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23
Q

Formula for Potash Alum

A

K2SO4.Al2(SO4)3.24H2O

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24
Q

Soda Alum consists of

A

Na+
Al3+

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25
Q

Chrome Alum consists of

A

K+
Cr3+

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26
Q

Ferric Alum consists of

A

K+
Fe3+

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27
Q

Use of Potash Alum

A

To Purify Drinking Water

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28
Q

Aniline Yellow is

A

p-aminoazobenzene

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29
Q

Aniline Yellow is prepared from

A

Diazoamino Benzene

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30
Q

End Point is

A

Practical end of titration shown by the indicator

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31
Q

Equivalence Point/Stoichiometric End Point is

A

Theorethical end point of Titration

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32
Q

Titration error is

A

Difference between End Point and Equivalence Point

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33
Q

Phenolphtalein is

A

Weak Acid
Dissociates in pH 8-10
White -> Pink

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34
Q

Methyl Orange is

A

Weak Base
Dissociates in pH 3.1-4.5
Yellow -> Pinkish Red

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35
Q

Colourless form of Indicators is

A

Benzenoid Form

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36
Q

Coloured form of Indicators is

A

Quinanoid Form

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37
Q

Indicator for SA+SB

A

HPh or MeOH

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38
Q

Indictor for SA+WB

A

MeOH

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39
Q

Indicator for WA+SB

A

HPh

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40
Q

Indicator for WA+WB

A

no Indicators

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41
Q

Preliminary Test with dil. H2SO4 is for

A

CO32-
S2-
SO32-
NO2-
CH3COO-

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42
Q

Starch Test is given by

A

Nitrite NO2-

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43
Q

Griss-Ilosvary test is given by

A

Nitrite NO2-

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44
Q

Preliminary Test conc. H2SO4 is given by

A

Cl-
Br-
I-
NO3-
C2O42-

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45
Q

Colour of Chromyl Chloride CrO2Cl2

A

Reddish-Brown Vapours

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46
Q

Color of Na2CrO4 and PbCrO4

A

Yellow

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47
Q

Colour of AgCl

48
Q

Colour of CrO5

49
Q

Bromide on starch Test gives

A

Yellow Colour

50
Q

Iodide on starch Test gives

A

Blue Colour

51
Q

Brown Ring is

A

Confirmation of Nitrate ion NO3-
[Fe(H2O)5NO]SO4
NitrosoFerrous Sulphate

52
Q

Colour of PbSO4 and BaSO4

53
Q

Colour test for Fe2+ or Fe3+

A

Light Green, Yellow, Brown

54
Q

Colour Test for Cu2+

55
Q

Colour Test for Ni2+

A

Bright Green

56
Q

Colour Test for Co2+

A

Blue, Violet, Red, Pink

57
Q

Colour Test for Mn2+

A

Light Pink

58
Q

Dry Heating Test of Cu2+

A

Cold -> Blue
Hot -> White

59
Q

Dry Heating Test of Fe2+

A

Cold -> Green
Hot -> Dry White or Yellow

60
Q

Dry Heating Test of Zn2+

A

Cold -> White
Hot -> Yellow

61
Q

Dry Heating Test of Co2+

A

Cold -> Pink
Hot -> Blue

62
Q

Flame test is done in

A

Non-luminous flame

63
Q

Flame Test for Cu2+

A

Colour of Flame by eye -> Green with Blue Centre
Colour of Flame through Blue Glass -> Green with Blue Centre

64
Q

Flame test for Sr2+

A

Colour of Flame by eye -> Cimson Red
Colour of Flame through Blue Glass -> Purple

65
Q

Flame Test for Ba2+

A

Colour of Flame by eye -> Apple Green
Colour of Flame through Blue Glass -> Bluish Green

66
Q

Flame Test for Ca2+

A

Colour of Flame by eye -> Brick Red
Colour of Flame through Blue Glass -> Green

67
Q

Borax Test of CuSO4 under non-luminous flame gives

A

Cupric Metaborate
Cu(BO2)2
Blue-Green beads

68
Q

Heating of Cupric Metaborate in Lummious Flames gves

A

Red & Opaque Metallic Copper

69
Q

Borax Bead test of Cu2+ in non-luminous flame

A

Cold-> Blue
Hot-> Green

70
Q

Borax Bead test of Cu2+ in luminous flame

A

Cold-> Red Opaque
Hot -> Colourless

71
Q

Borax Bead test of Ni2+ in non-luminous flame

A

Cold-> Reddish Brown
Hot-> Violet

72
Q

Borax Bead test of Ni2+ in luminous flame

A

Cold-> Grey
Hot-> Grey

73
Q

Borax Bead test of Mn2+ in non-luminous flame

A

Cold-> Light Violet
Hot-> Light Violet

74
Q

Borax Bead test of Mn2+ in luminous flame

A

Cold-> Colourless
Hot-> Colourless

75
Q

Borax Bead test of Fe2+ in non-luminous flame

A

Cold-> Yellow
Hot-> Yellow-Brown

76
Q

Borax Bead test of Fe2+ in luminous flame

A

Cold-> Green
Hot-> Green

77
Q

In Charcoal Cavity Test/Blowpipe Test, for Oxidising Flame, Blowpipe is

A

1/3 inserted into flame

78
Q

In Charcoal Cavity Test/Blowpipe Test, for Reducing Flame, Blowpipe is

A

held to surface of flame

79
Q

Charcoal Cavity Test/Blowpipe Test of Pb

A

Yellow Residue when hot & grey metal when cold

80
Q

Charcoal Cavity Test/Blowpipe Test of As

A

White Residue with the odour of garlic

81
Q

Charcoal Cavity Test/Blowpipe Test of Cd

A

Brown Residue

82
Q

Charcoal Cavity Test/Blowpipe Test of Zn

A

Yellow Residue when hot & white when cold

83
Q

Cobalt Nitrate Test of Zn

A

ZnO.CoO Rinmann’s Green

84
Q

Cobalt Nitrate Test of Mg

A

MgO.CoO Pink

85
Q

Cobalt Nitrate Test of Al

A

Al2O3.CoO Blue

86
Q

Salt is insoluble if it doesn’t dissolve in

A

Aqua-Regia

87
Q

Aqua Regia is

A

1:3 mixture of
Conc. HNO3+Conc. HCl

88
Q

Group Zero Cation

89
Q

Group I Cation

90
Q

Group II Cations

A

Pb2+, Cu2+

91
Q

Group III Cations

A

Al3+, Fe3+

92
Q

Group IV Cations

A

Ni2+, Zn2+

93
Q

Group V Cations

A

Ba2+, Ca2+

94
Q

Group VI Cation

95
Q

Colour of PbI2

96
Q

Colour of Na2[Pb(OH)4]

97
Q

Colour of PbS and CuS

98
Q

Colour of As2S3

99
Q

Colour of [Cu(NH3)4]SO4

A

Deep Blue Soluble Complex

100
Q

Colour of Cu2[Fe(CN)6]

A

Chocolate Brown

101
Q

Colour of Al(OH)3

A

White Gelatinous

102
Q

Colour of Fe(OH)3

103
Q

Lake Test is for

A

Alumnium
(Al(OH)3 adsorbs to blue colour to form lake)

104
Q

Colour of Fe4[Fe(CN)6]3

A

Prussian Blue or Green

105
Q

Soluble Prussian Blue is

A

KFe[Fe(CN)6]

106
Q

Colour of NiS and CoS

107
Q

Colour of MnS

108
Q

Colour of ZnS

109
Q

Clour of Zn2[Fe(CN)6]

A

White/Bluish-White

110
Q

Colour of [Ni(dmg)2]

A

Wine Red
(dsp2)

111
Q

Colour of Mg(NH4)PO4

112
Q

Diameter of Dispersed Particles in a Colloid

A

1nm-1000nm

113
Q

Lyophilic Colloids

A

Egg Albumin sol (Egg White + NaCl)
Starch/Gum sol (Starch/Gum in hot water)

114
Q

Lyophobic Colloids

A

Fe(OH)3/Al(OH)3 sol
As2S3 (from As2O3)

115
Q

Main Reason for Lyophilic Colloids

A

Solvent Layer around oloid due to solvation

116
Q

Main Reason for Lyophobic Colloids

117
Q

Clock Reaction is

A

Starch + I2
In presence of S2O32-

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