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d- and f-Block Elements · Question 50

AIPMT 2011 (Prelims)MCQHard📈 Topic in 25% papers+4−1
1

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

  1. Mn > Fe > Cr > Co
  2. Fe > Mn > Co > Cr
  3. Co > Mn > Fe > Cr
  4. Cr > Mn > Co > Fe

Answer

(1) Mn > Fe > Cr > Co

Solution

Configurations of the M2+ ions:

Cr2+: [Ar]3d4; Mn2+: [Ar]3d5; Fe2+: [Ar]3d6; Co2+: [Ar]3d7

As per NCERT, Mn2+ has a stable half-filled d5 configuration the +2 state is most stable for Mn.

Fe2+ (d6) comes next; Cr2+ (d4) is a strong reducing agent, being easily oxidised to the more stable Cr3+ ( t2g3).

Order of stability of the +2 state: Mn > Fe > Cr > Co

Answer: (1)

AIPMT 2011 (Prelims)

Keep practising — d- and f-Block Elements

2

Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of

  1. Cr2(SO4)3
  2. CrO42-
  3. Cr2(SO3)3
  4. CrSO4
AIPMT 2011 (Prelims)
3

Which of the following oxidation states is the most common among the lanthanoids?

  1. 4
  2. 2
  3. 5
  4. 3
AIPMT 2010 (Mains)
4

Which of the following ions will exhibit colour in aqueous solutions?

  1. La3+ (Z = 57)
  2. Ti3+ (Z = 22)
  3. Lu3+ (Z = 71)
  4. Sc3+ (Z = 21)
AIPMT 2010 (Prelims)
5

Which of the following ions has electronic configuration [Ar]3d6? (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

  1. Ni3+
  2. Mn3+
  3. Fe3+
  4. Co3+
AIPMT 2010 (Prelims)
6

Which of the following pairs has the same size?

  1. Fe2+, Ni2+
  2. Zr4+, Ti4+
  3. Zr4+, Hf4+
  4. Zn2+, Hf4+
AIPMT 2010 (Prelims)
7

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

  1. 3d54s1
  2. 3d54s2
  3. 3d24s2
  4. 3d34s2
AIPMT 2009
8

Out of TiF62-, CoF63-, Cu2Cl2 and NiCl42- (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are

  1. Cu2Cl2 and NiCl42-
  2. TiF62- and Cu2Cl2
  3. CoF63- and NiCl42-
  4. TiF62- and CoF63-
AIPMT 2009
9

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
AIPMT 2008
10

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
11

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

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