d- and f-Block Elements

Among CrO, Cr2O3 and CrO3, the sum of spin-only magnetic moment values of basic and amphoteric oxides is 10-2 BM (nearest integer). (Given atomic number of Cr is 24 )

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)

Among VO2+, MnO4- and Cr2O72-, the spin-only magnetic moment value of the species with least oxidising ability is BM (Nearest integer). (Given atomic number V = 23, Mn = 25, Cr = 24)

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

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

The spin-only magnetic moment value of the ion among Ti2+, V2+, Co3+ and Cr2+, that acts as strong oxidising agent in aqueous solution is BM (Near integer). (Given atomic numbers : Ti : 22, V : 23, Cr : 24, Co : 27)

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 fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of CO2. The sum of spin-only magnetic moment values of A and B is B.M. (Nearest integer) [Given atomic number : C : 6, Na : 11, O : 8, Fe : 26, Cr : 24]

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

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

Consider the following reaction MnO2 + KOH + O2 A + H2O. Product 'A' in neutral or acidic medium disproportionate to give products 'B' and 'C' along with water. The sum of spin-only magnetic moment values of B and C is BM. (nearest integer) (Given atomic number of Mn is 25)

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

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M2On (where n = 3, 4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is BM (near integer) (Given atomic number: Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu : 29, Zn : 30)

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

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is (+) .

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

1. A-III, B-IV, C-I, D-II
2. A-I, B-II, C-III, D-IV
3. A-IV, B-III, C-I, D-II
4. A-II, B-I, C-IV, D-III

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.

KMnO4 decomposes on heating at 513 K to form O2 along with

1. K2MnO4 & Mn
2. MnO2 & K2O2
3. K2MnO4 & MnO2
4. Mn & KO2

In alkaline medium, MnO4- oxidises I- to

1. I2
2. IO3-
3. IO-
4. IO4-

Which of the following acts as a strong reducing agent? (Atomic number: Ce = 58, Eu = 63, Gd = 64, Lu = 71)

1. Eu2+
2. Gd3+
3. Lu3+
4. Ce4+

Which of the following statements are correct about Zn, Cd and Hg? Choose the most appropriate from the options given below:

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

Which of the following electronic configuration would be associated with the highest magnetic moment?

1. [Ar]3d7
2. [Ar]3d8
3. [Ar]3d3
4. [Ar]3d6

The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]

1. [Xe]4f4 6s2
2. [Xe]5f4 7s2
3. [Xe]4f6 6s2
4. [Xe]4f1 5d1 6s2