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Principles Related to Practical Chemistry

JEE Main 2024 (Online) 30th January Morning ShiftNumericalEasy📈 Topic in 42% papers+4
Ques. 1JEE Main 2024, 30 January (Morning Shift)

On a thin layer chromatographic plate, an organic compound moved by 3.5 cm, while the solvent moved by 5 cm. The retardation factor of the organic compound is 10-1.

Answer

7

Solution

Rf = distance moved by compounddistance moved by solvent

= 3.55 = 0.7 = 7 10-1

Answer: 7

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Ques. 2JEE Main 2024, 30 January (Evening Shift)

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

  1. Distillation
  2. Sublimation
  3. Column Chromatography
  4. Differential Extraction
Ques. 3JEE Main 2024, 30 January (Evening Shift)

Number of metal ions characterized by flame test among the following is . Sr2+, Ba2+, Ca2+, Cu2+, Zn2+, Co2+, Fe2+

Ques. 4JEE Main 2024, 29 January (Morning Shift)

In chromyl chloride test for confirmation of Cl- ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10\% H2O2 turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

  1. +6
  2. +5
  3. +3
  4. +10
Ques. 5JEE Main 2024, 29 January (Morning Shift)

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO4 in presence of concentrated H2SO4 indicates the presence of element/s

  1. Br
  2. S
  3. N and S
  4. N
Ques. 6JEE Main 2024, 29 January (Evening Shift)

On passing a gas, 'X', through Nessler's reagent, a brown precipitate is obtained. The gas 'X' is

  1. Cl2
  2. CO2
  3. NH3
  4. H2S
Ques. 7JEE Main 2024, 29 January (Evening Shift)

Chromatographic technique/s based on the principle of differential adsorption is / are Choose the most appropriate answer from the options given below:

  1. B only
  2. A only
  3. A & B only
  4. C only
Ques. 8JEE Main 2024, 29 January (Evening Shift)

A reagent which gives brilliant red precipitate with Nickel ions in basic medium is

  1. dimethyl glyoxime
  2. sodium nitroprusside
  3. meta-dinitrobenzene
  4. neutral FeCl3
Ques. 9JEE Main 2024, 29 January (Evening Shift)

The oxidation number of iron in the compound formed during brown ring test for NO3- ion is .

Ques. 10JEE Main 2024, 27 January (Morning Shift)

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :

  1. Tetraanionic complex with coordination number six
  2. Neutral complex with coordination number four
  3. Dianionic complex with coordination number six
  4. Dianionic complex with coordination number four
Ques. 11JEE Main 2024, 27 January (Morning Shift)

NaCl reacts with conc. H2SO4 and K2Cr2O7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ;

  1. CrO2Cl2, Na2CrO4
  2. Na2CrO4, CrO2Cl2
  3. CrO2Cl2, KHSO4
  4. CrO2Cl2, Na2Cr2O7

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