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Principles Related to Practical Chemistry · Question 4

JEE Main 2026 (Online) 6th April Evening ShiftMCQEasy📈 Topic in 16% papers+4−1
1

Treatment of a gas 'X' with a freshly prepared ferrous sulphate solution gives a compound 'Y' as a brown ring. The compounds X and Y are:

  1. NO and [Fe(NO)]SO4
  2. NO2 and [Fe(NO2)]SO4
  3. N2O and [Fe(N2O)]SO4
  4. N2O4 and [Fe(N2O4)]SO4

Answer

(1) NO and [Fe(NO)]SO4

Solution

Brown ring test (nitrate ion): NO3- is reduced by Fe2+ in conc. H2SO4 to nitric oxide:

NO3- + 3Fe2+ + 4H+ NO + 3Fe3+ + 2H2O

NO combines with excess Fe2+ to form the brown complex:

[Fe(H2O)6]2+ + NO [Fe(H2O)5(NO)]2+ + H2O

i.e. nitrosoferrous sulphate, written [Fe(NO)]SO4

∴ X = NO, Y = [Fe(NO)]SO4

Answer: (1)

JEE Main 2026 (Online) 6th April Evening Shift

Keep practising — Principles Related to Practical Chemistry

2

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 5th April Morning Shift
3

In an estimation of sulphur by Carius method 0.2 g of the substance gave 0.6 g of BaSO4. The percentage of sulphur in the substance is %. (Given molar mass in g mol-1 S : 32, BaSO4 : 233)

JEE Main 2026 (Online) 5th April Morning Shift
4

Match List - I with List - II.

  1. A-II, B-III, C-I, D-IV
  2. A-II, B-IV, C-I, D-III
  3. A-II, B-IV, C-III, D-I
  4. A-IV, B-III, C-II, D-I
JEE Main 2026 (Online) 5th April Evening Shift
5

A paper dipped in a dil. H2SO4 solution of 'X' upon treatment with SO2 gas turns into green. The compound 'X' is :

  1. KI-starch
  2. KMnO4
  3. Pb(CH3COO)2
  4. K2Cr2O7
JEE Main 2026 (Online) 5th April Evening Shift
6

Identify the colour of compound 'X' in the sequence of the reaction. [figure]

  1. Violet
  2. Green
  3. Red
  4. Colourless
JEE Main 2026 (Online) 4th April Morning Shift
7

2.0 g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave 3.36 g of AgBr. The percentage of carbon in the compound (X) is 26.7%. Total number of carbon atoms in the empirical formula for compound (X) is . (Given molar mass in g mol-1 H : 1, C : 12, Br : 80, Ag : 108)

JEE Main 2026 (Online) 4th April Morning Shift
8

Among Fe3+, Pb2+, Cu2+ and Mn2+, identify the one that gets precipitated out while passing H2S in presence of NH4OH as group reagent. The highest possible oxidation state of the corresponding metal is

  1. +3
  2. +4
  3. +2
  4. +7
JEE Main 2026 (Online) 4th April Evening Shift
9

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

  1. A-III, B-I, C-IV, D-II
  2. A-III, B-IV, C-I, D-II
  3. A-I, B-III, C-II, D-IV
  4. A-I, B-II, C-III, D-IV
JEE Main 2026 (Online) 4th April Evening Shift
10

In sulphur estimation, 2.0 10-3 mol of an organic compound (X) (molar mass 76 g mol-1) gave 0.4813 g of barium sulphate (molar mass 233 g mol-1). The percentage of sulphur in the compound (X) is 10-1 % (Nearest integer)

JEE Main 2026 (Online) 4th April Evening Shift
11

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 2nd April Morning Shift

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