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Principles Related to Practical Chemistry · Question 14

RE-NEET (UG) 2024MCQEasy📈 Topic in 50% papers+4−1
1

A steam volatile organic compound which is immiscible with water has a boiling point of 250 C. During steam distillation, a mixture of this organic compound and water will boil :

  1. above 100 C but below 250 C
  2. above 250 C
  3. at 250 C
  4. close to but below 100 C

Answer

(4) close to but below 100 C

Solution

In steam distillation the mixture boils when the sum of the vapour pressures equals atmospheric pressure: p1 + p2 = patm.

Water alone needs pwater = patm (at 100 C); with the organic compound's small vapour pressure added, this is reached at a temperature slightly lower than 100 C.

So the mixture boils close to but below 100 C.

Answer: (4)

RE-NEET (UG) 2024

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2

Match List-I with List-II : Choose the correct answer from the options given below :

  1. A-IV, B-II, C-III, D-I
  2. A-II, B-IV, C-III, D-I
  3. A-II, B-III, C-IV, D-I
  4. A-III, B-IV, C-II, D-I
RE-NEET (UG) 2024
3

Match List I with List II: Choose the correct answer from the options given below:

  1. A-II, B-III, C-IV, D-I
  2. A-IV, B-III, C-II, D-I
  3. A-I, B-II, C-III, D-IV
  4. A-II, B-III, C-I, D-IV
RE-NEET (UG) 2024
4

On complete combustion, 0.3 g of an organic compound gave 0.2 g of CO2 and 0.1 g of H2O. The percentage composition of carbon and hydrogen in the compound, respectively is:

  1. 4.07% and 15.02%
  2. 18.18% and 3.70%
  3. 15.02% and 4.07%
  4. 3.70% and 18.18%
RE-NEET (UG) 2024
5

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe3+ due to the formation of-

  1. NaSCN
  2. [Fe(CN)5NOS]4-
  3. [Fe(SCN)]2+
  4. Fe4[Fe(CN)6]3 xH2O
NEET (UG) 2023
6

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022
7

Paper chromatography is an example of :

  1. Partition chromatography
  2. Thin layer chromatography
  3. Column chromatography
  4. Adsorption chromatography
NEET (UG) 2020
8

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

  1. chromatography
  2. crystallisation
  3. steam distillation
  4. sublimation.
NEET 2017
9

In Dumas method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

  1. 16.75
  2. 15.76
  3. 17.36
  4. 18.20
AIPMT 2015 (Cancelled)
10

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is

  1. 37.33
  2. 45.33
  3. 35.33
  4. 43.33
AIPMT 2014
11

Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?

  1. Fe3[Fe(CN)6]2
  2. Fe4[Fe(CN)6]3
  3. Fe4[Fe(CN)6]2
  4. Fe3[Fe(CN)6]3
NEET 2013 (Karnataka)

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