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d- and f-Block Elements · Question 58

AIPMT 2008MCQMedium📈 Topic in 0% papers+4−1
1

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is

  1. Mn > Cr > Ti > V
  2. Ti > V > Cr > Mn
  3. Cr > Mn > V > Ti
  4. V > Mn > Cr > Ti

Answer

(3) Cr > Mn > V > Ti

Solution

The second electron is removed from the unipositive ion M+.

Cr+ (3d5): the electron must come from a stable half-filled d subshell highest value.

Mn+ (3d54s1): the 4s electron is removed, but the nuclear charge is high next highest.

V+ and Ti+: value increases with nuclear charge V > Ti.

As per NCERT (Table of ionisation enthalpies of 3d series), iH2 ( kJ mol-1): Cr 1592, Mn 1509, V 1414, Ti 1310.

Cr > Mn > V > Ti

Answer: (3)

AIPMT 2008

Keep practising — d- and f-Block Elements

2

Which one of the following ions is the most stable in aqueous solution? (At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

  1. V3+
  2. Ti3+
  3. Mn3+
  4. Cr3+
AIPMT 2007
3

Identify the incorrect statement among the following:

  1. Lanthanoid contraction is the accumulation of successive shrinkages.
  2. As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
  3. Shielding power of 4f electrons is quite weak.
  4. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
AIPMT 2007
4

In which of the following pairs are both the ions coloured in aqueous solution? (At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

  1. Ni2+, Cu+
  2. Ni2+, Ti3+
  3. Sc3+, Ti3+
  4. Sc3+, Co2+.
AIPMT 2006
5

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-
AIPMT 2006
6

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
7

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
8

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
9

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
10

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
11

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

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