d- and f-Block Elements

Which of the following oxidation reactions are carried out by both K2Cr2O7 and KMnO4 in acidic medium? Choose the correct answer from the options given below :

1. A, B and C Only
2. C, D and E Only
3. B, C and D Only
4. A, D and E Only

The amphoteric oxide among V2O3, V2O4 and V2O5, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :

1. + 4
2. + 5
3. + 3
4. + 7

Preparation of potassium permanganate from MnO2 involves two step process in which the 1st step is a reaction with KOH and KNO3 to produce

1. K3MnO4
2. K4[Mn(OH)6]
3. K2MnO4
4. KMnO4

Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)

1. Lu3+
2. Eu2+
3. Tb4+
4. Ce3+

The correct set of ions (aqueous solution) with same colour from the following is:

1. V2+, Cr3+, Mn3+
2. Ti4+, V4+, Mn2+
3. Sc3+, Ti3+, Cr2+
4. Zn2+, V3+, Fe3+

Consider the following reactions K2Cr2O7 [-H2O]KOH [A] [-H2O]H2SO4 [B] + K2SO4 The products [A] and [B], respectively are :

1. K2Cr(OH)6 and Cr2O3
2. K2CrO4 and Cr2O3
3. K2CrO4 and K2Cr2O7
4. K2CrO4 and CrO

Lanthanoid ions with 4f7 configuration are : Choose the correct answer from the options given below :

1. B and E only
2. B and C only
3. A and D only
4. A and B only

The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct?

1. Cu(II) is more stable
2. Cu(II) is less stable
3. Cu(I) and Cu(II) are equally stable
4. Stability of Cu(I) and Cu(II) depends on nature of copper salts

The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium = 99)

1. [Rn]5f136d07s2
2. [Rn]5f126d07s2
3. [Rn]5f116d07s2
4. [Rn]5f106d07s2

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 false
3. Both Statement I and Statement II are true
4. Statement I is false but Statement II is true

Iron (III) catalyses the reaction between iodide and persulphate ions, in which Choose the most appropriate answer from the options given below:

1. B and C only
2. A only
3. A and D only
4. B only

The equilibrium Cr2O72- 2CrO42- is shifted to the right in :

1. a weakly acidic medium
2. a basic medium
3. a neutral medium
4. an acidic medium

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. Statement I is true but Statement II is false
3. Both Statement I and Statement II are false
4. Both Statement I and Statement II are true

The number of elements from the following that do not belong to lanthanoids is Eu, Cm, Er, Tb, Yb and Lu

1. 3
2. 1
3. 4
4. 5

Arrange the following elements in the increasing order of number of unpaired electrons in it. Choose the correct answer from the options given below :

1. (A) < (D) < (C) < (B) < (E)
2. (A) < (D) < (C) < (E) < (B)
3. (B) < (C) < (D) < (E) < (A)
4. (C) < (E) < (B) < (A) < (D)

The metal that shows highest and maximum number of oxidation state is :

1. Co
2. Mn
3. Fe
4. Ti

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is . Ti2+, Cr2+ and V2+

1. 1
2. 2
3. 3
4. 0

The element which shows only one oxidation state other than its elemental form is :

1. Nickel
2. Titanium
3. Cobalt
4. Scandium

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal is

1. 22
2. 23
3. 26
4. 25

In acidic medium, K2Cr2O7 shows oxidising action as represented in the half reaction: Cr2O72- + XH+ + Ye 2A + ZH2O X, Y, Z and A are respectively :

1. 14, 7, 6 and Cr3+
2. 14, 6, 7 and Cr3+
3. 8, 4, 6 and Cr2O3
4. 8, 6, 4 and Cr2O3

The transition metal having highest 3rd ionisation enthalpy is :

1. Mn
2. Fe
3. Cr
4. V

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

1. (A) is true but (R) is false
2. Both (A) and (R) are true and (R) is the correct explanation of (A)
3. Both (A) and (R) are true but (R) is not the correct explanation of (A)
4. (A) is false but (R) is true

Which of the following compounds show colour due to d-d transition?

1. K2Cr2O7
2. CuSO4 5H2O
3. KMnO4
4. K2CrO4

Identify correct statements from below: Choose the correct answer from the options given below:

1. B, D, E only
2. A, B, C only
3. A, D, E only
4. B, C, D only

The metals that are employed in the battery industries are Choose the correct answer from the options given below:

1. A, B, C, D and E
2. A, B, C and D only
3. B, D and E only
4. B, C and E only

Choose the correct statements from the following Choose the correct answer from the options given below :

1. A, B and D only
2. A, B and C only
3. A and C only
4. B and C only

Diamagnetic Lanthanoid ions are :

1. La3+ \& Ce4+
2. Nd3+ \& Ce4+
3. Lu3+ \& Eu3+
4. Nd3+ \& Eu3+

A and B formed in the following reactions are: CrO2Cl2 + 4NaOH A + 2NaCl + 2H2O, A + 2HCl + 2H2O2 B + 3H2O

1. A = Na2Cr2O7, B = CrO5
2. A = Na2CrO4, B = CrO5
3. A = Na2Cr2O4, B = CrO4
4. A = Na2Cr2O7, B = CrO3

Alkaline oxidative fusion of MnO2 gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

1. Mn2O3 and MnO42-
2. Mn2O7 and MnO4-
3. MnO42- and MnO4-
4. MnO42- and Mn2O7

The orange colour of K2Cr2O7 and purple colour of KMnO4 is due to

1. Charge transfer transition in both.
2. d d transitions in KMnO4 and charge transfer transitions in K2Cr2O7.
3. d d transitions in both
4. d d transitions in K2Cr2O7 and charge transfer transitions in KMnO4.