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d- and f-Block Elements

AIPMT 2008MCQMediumNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2008

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+.

For Cr+ (3d5) the electron must come from a stable half-filled d subshell, so its value is the highest. For Mn+ (3d54s1) the 4s electron is removed, but the nuclear charge is high, so it comes next. For V+ and Ti+ the value increases with nuclear charge, so 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)

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Ques. 2AIPMT 2007

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+
Ques. 3AIPMT 2007

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.
Ques. 4AIPMT 2006

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+.
Ques. 5AIPMT 2006

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-
Ques. 6AIPMT 2006

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.
Ques. 7AIPMT 2005

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.
Ques. 8AIPMT 2005

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
Ques. 9AIPMT 2005

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)
Ques. 10AIPMT 2005

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+
Ques. 11AIPMT 2004

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

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