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d- and f-Block Elements · Question 65

AIPMT 2005MCQMedium📈 Topic in 38% papers+4−1
1

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

Answer

(2) two

Solution

As per NCERT, in neutral or faintly alkaline medium permanganate oxidises iodide to iodate:

2MnO4- + I- + H2O 2MnO2 + IO3- + 2OH-

I- (-1) IO3- (+5): 6 electrons lost per I-

MnO4- (+7) MnO2 (+4): 3 electrons gained per MnO4-

Moles of KMnO4 reduced by 1 mol KI = 63 = 2

Answer: (2)

AIPMT 2005

Keep practising — d- and f-Block Elements

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is (Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

  1. Y3+ < La3+ < Eu3+ < Lu3+
  2. Y3+ < Lu3+ < Eu3+ < La3+
  3. Lu3+ < Eu3+ < La3+ < Y3+
  4. La3+ < Eu3+ < Lu3+ < Y3+
AIPMT 2003
10

General electronic configuration of lanthanides is

  1. (n-2)f1-14 (n-1)s2p6d0-1 ns2
  2. (n-2)f0-14 (n-1)d0-1 ns2
  3. (n-2)f0-14 (n-1)d10 ns2
  4. (n-2)d0-1 (n-1)f1-14 ns2
AIPMT 2002
11

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
AIPMT 2002

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