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d- and f-Block Elements · Question 62

AIPMT 2006MCQMedium📈 Topic in 25% papers+4−1
1

Copper sulphate dissolves in excess of KCN to give

  1. Cu(CN)2
  2. CuCN
  3. [Cu(CN)4]3-
  4. [Cu(CN)4]2-

Answer

(3) [Cu(CN)4]3-

Solution

CuSO4 + 2KCN Cu(CN)2 + K2SO4

Cu(CN)2 is unstable and decomposes:

2Cu(CN)2 2CuCN + (CN)2

With excess KCN, CuCN dissolves forming a soluble complex:

CuCN + 3KCN K3[Cu(CN)4]

∴ The final species is [Cu(CN)4]3- (copper in +1 state).

Answer: (3)

AIPMT 2006

Keep practising — d- and f-Block Elements

2

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

  1. more active nature of the actinoids
  2. more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  3. lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  4. greater metallic character of the lanthanoids than that of the corresponding actinoids.
AIPMT 2006
3

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

  1. more active nature of the actinoids
  2. more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  3. lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  4. greater metallic character of the lanthanoids than that of the corresponding actinoids.
AIPMT 2005
4

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

  1. one
  2. two
  3. five
  4. one fifth
AIPMT 2005
5

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

  1. Vanadium (Z = 23)
  2. Chromium (Z = 24)
  3. Manganese (Z = 25)
  4. Iron (Z = 26)
AIPMT 2005
6

The aqueous solution containing which one of the following ions will be colourless? (Atomic number : Sc = 21, Fe = 26, Ti = 22, Mn = 25)

  1. Sc3+
  2. Fe2+
  3. Ti3+
  4. Mn2+
AIPMT 2005
7

Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is

  1. Fe
  2. Zn
  3. K
  4. Ca
AIPMT 2004
8

Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is [At. Nos. Ti = 22, V = 23, Cr = 24, Mn = 25]

  1. Ti3+, V2+, Cr3+, Mn4+
  2. Ti+, V4+, Cr6+, Mn7+
  3. Ti4+, V3+, Cr2+, Mn3+
  4. Ti2+, V3+, Cr4+, Mn5+
AIPMT 2004
9

Lanthanoids are

  1. 14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
  2. 14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel
  3. 14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel
  4. 14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.
AIPMT 2004
10

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

  1. High enthalpy of atomization
  2. Paramagnetic behaviour
  3. Colour of hydrated ions
  4. Variable oxidation states
AIPMT 2003
11

The basic character of the transition metal monoxides follows the order (Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)

  1. VO > CrO > TiO > FeO
  2. CrO > VO > FeO > TiO
  3. TiO > FeO > VO > CrO
  4. TiO > VO > CrO > FeO
AIPMT 2003

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