Which of the following statements are correct?
A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.
B. Aniline can be purified by steam distillation as aniline is miscible in water.
C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.
D. An organic compound is pure, if mixed M.P. is remained same.
Choose the most appropriate answer from the options given below :
02Medium64×since 2004Q1755
Given below are two statements :
Statement I : Sulphanilic acid gives esterification test for carboxyl group.
Statement II : Sulphanilic acid gives red colour in Lassigne's test for extra element detection.
In the light of the above statements, choose the most appropriate answer from the options given below :
03Easy64×since 2004Q1756
In Dumas method for the estimation of N2, the sample is heated with copper oxide and the gas evolved is passed over :
04Easy64×since 2004Q1757
Compound that will give positive Lassaigne's test for both nitrogen and halogen is :
05Easy64×since 2004Q1722
The compound formed in the positive test for nitrogen with the Lassaigne solution of an
organic compound is
06Medium64×since 2004Q1723
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method
and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid
required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in
the compound is
07Hard64×since 2004Q1724
The correct match between Item-I and Item-II is :
.tg {border-collapse:collapse;border-spacing:0;border:none;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:0px;overflow:hidden;word-break:normal;}
.tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:0px;overflow:hidden;word-break:normal;}
.tg .tg-bzci{font-size:20px;text-align:center;vertical-align:top}
.tg .tg-p7ly{font-weight:bold;font-size:20px;text-align:center}
.tg .tg-fbrz{font-weight:bold;font-size:20px;text-align:center;vertical-align:top}
.tg .tg-4kyz{font-size:20px;text-align:center}
Item-I (drug)
Item-II (test)
A
Chloroxylenol
P
Carbylamine test
B
Norethindrone
Q
Sodium hydrogen carbonet test
C
Sulphapyridine
R
Ferric chloride test
D
Penicillin
S
Bayer's test
08Medium64×since 2004Q1725
An organic compound 'A' is oxidizod with Na₂O₂ followed by boiling with HNO₃. The resultant solution is
then treated with ammonium molybdate to yield a yellow precipitate.
Based on above observation, the
element present in the given compound is:
09Easy64×since 2004Q1726
If you spill a chemical toilet cleaning liquid on
your hand, your first aid would be
10Easy64×since 2004Q1727
Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?
11Easy64×since 2004Q1728
Which of the following is 'a' FALSE statement ?
12Easy64×since 2004Q1729
Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.
13Medium64×since 2004Q1730
Match List - I with List - II :
List - I
Test/Reagents/Observation(s)
List - II
Species detected
(a)
Lassaigne's Test
(i)
Carbon
(b)
Cu(II) oxide
(ii)
Sulphur
(c)
Silver nitrate
(iii)
N, S, P, and halogen
(d)
The sodium fusion extract
gives black precipitate with
acetic acid and lead acetate
(iv)
Halogen Specifically
The correct match is :
14Easy64×since 2004Q1731
Which one of the following complexes is violet in colour?
15Medium64×since 2004Q1732
Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :
16Medium64×since 2004Q1768
Given below are two statements :
Statement I : The identification of Ni²⁺ is carried out by dimethyl glyoxime in the presence of NH₄OH.
Statement II : The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements, choose the correct answer from the options given below :
17Medium64×since 2004Q1754
The reagent neutral ferric chloride is used to detect the presence of ______________
18Medium64×since 2004Q1733
In Kjeldahl's method for estimation of nitrogen, CuSO4 acts as :
19Hard64×since 2004Q1734
The technique used for purification of steam volatile water immiscible substances is :
20Easy64×since 2004Q1735
The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is -