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d- and f-Block Elements

JEE Main 2026 (Online) 2nd April Morning ShiftMCQEasy📈 Topic in 18% papers+4−1
Ques. 1JEE Main 2026, 2 April (Morning Shift)

Which of the following sets includes all the species that will change the orange colour of K2Cr2O7 in acidic medium ?

  1. Fe2+, Sn2+, I-, S2-
  2. S2-, Fe3+, I-, C2O42-
  3. Fe2+, NO2-, SO2, Sn4+
  4. Fe3+, SO42-, S2-, Sn4+

Answer

(1) Fe2+, Sn2+, I-, S2-

Solution

Acidified K2Cr2O7 is an oxidising agent; its orange colour changes to green only when it is reduced:

Cr2O72- + 14H+ + 6e- 2Cr3+ + 7H2O

So every species in the set must be a reducing agent (able to be oxidised).

(1) Fe2+ Fe3+, Sn2+ Sn4+, I- I2, S2- S — all are oxidised ✓

(2) Fe3+ is already in its higher stable oxidation state and cannot be oxidised ✗

(3) Sn4+ cannot be oxidised further ✗

(4) Fe3+, SO42- (S = +6) and Sn4+ cannot be oxidised ✗

Answer: (1)

Keep practising — d- and f-Block Elements

Ques. 2JEE Main 2026, 2 April (Evening Shift)

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
Ques. 3JEE Main 2026, 2 April (Evening Shift)

Among Fe2+, Fe3+, Cr2+ and Zn2+, the ion that shows positive borax bead test and with highest ionisation enthalpy is :

  1. Fe2+
  2. Zn2+
  3. Cr2+
  4. Fe3+
Ques. 4JEE Main 2026, 2 April (Evening Shift)

Number of paramagnetic ions among the following d- and f-block metal ions is . Mn2+, Cu2+, Zn2+, Yb2+, Sc3+, La3+, Gd3+, Lu3+, Ti4+, Ce4+ (Atomic number of Mn = 25, Cu = 29, Zn = 30, Yb = 70, Sc = 21, La = 57, Gd = 64, Lu = 71, Ti = 22, Ce = 58)

Ques. 5JEE Main 2026, 28 January (Morning Shift)

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

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 6JEE Main 2026, 28 January (Evening Shift)

Consider the following statements about manganate and permanganate ions. Identify the correct statements. Choose the correct answer from the options given below :

  1. A and D Only
  2. A, B and C Only
  3. A, C and D Only
  4. A, D and E Only
Ques. 7JEE Main 2026, 24 January (Evening Shift)

"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in "X". The color of the potassium salt of X is

  1. purple
  2. orange
  3. yellow
  4. green
Ques. 8JEE Main 2026, 23 January (Evening Shift)

The oxidation state of chromium in the final product formed in the reaction between KI and acidified K2Cr2O7 solution is :

  1. +2
  2. +3
  3. +4
  4. +6
Ques. 9JEE Main 2026, 22 January (Evening Shift)

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

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
Ques. 10JEE Main 2026, 22 January (Evening Shift)

Among the following oxides of 3d elements, the number of mixed oxides are . Ti2O3, V2O4, Cr2O3, Mn3O4, Fe3O4, Fe2O3, Co3O4

Ques. 11JEE Main 2026, 21 January (Morning Shift)

MnO42-, in acidic medium, disproportionates to :

  1. MnO4- and MnO
  2. MnO4- and MnO2
  3. Mn2O7 and MnO2
  4. Mn2O7 and MnO

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