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d- and f-Block Elements · Question 42

NEET 2013 (Karnataka)MCQEasy📈 Topic in 25% papers+4−1
1

The outer electronic configuration of Gd (At. No. 64) is

  1. 4f5 5d4 6s1
  2. 4f7 5d1 6s2
  3. 4f3 5d5 6s2
  4. 4f4 5d5 6s1

Answer

(2) 4f7 5d1 6s2

Solution

Gd (Z = 64): [Xe] 4f7 5d1 6s2

∵ The half-filled 4f7 subshell is extra stable, the eighth electron enters 5d instead of 4f.

As per NCERT, gadolinium has the configuration [Xe] 4f7 5d1 6s2.

Answer: (2)

NEET 2013 (Karnataka)

Keep practising — d- and f-Block Elements

2

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because

  1. both Sc3+ and Zn2+ ions are colourless and form white compounds.
  2. in case of Sc, 3d orbitals are partially filled but in Zn these are filled.
  3. last electron is assumed to be added to 4s level in case of Zn.
  4. both Sc and Zn do not exhibit variable oxidation states.
NEET 2013 (Karnataka)
3

The catalytic activity of transition metals and their compounds is ascribed mainly to

  1. their magnetic behaviour
  2. their unfilled d-orbitals
  3. their ability to adopt variable oxidation states
  4. their chemical reactivity
AIPMT 2012 (Mains)
4

Which of the following exhibits only + 3 oxidation state?

  1. U
  2. Th
  3. Ac
  4. Pa
AIPMT 2012 (Mains)
5

Which one of the following does not correctly represent the correct order of the property indicated against it?

  1. Ti < V < Cr < Mn : increasing number of oxidation states
  2. Ti3+ < V3+ < Cr3+ < Mn3+ : increasing magnetic moment
  3. Ti < V < Cr < Mn : increasing melting points
  4. Ti < V < Mn < Cr : increasing 2nd ionization enthalpy
AIPMT 2012 (Mains)
6

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential ( E M2+/M ) value has a positive sign?

  1. Co (Z = 27)
  2. Ni (Z = 28)
  3. Cu (Z = 29)
  4. Fe (Z = 26)
AIPMT 2012 (Mains)
7

Identify the alloy containing a non-metal as a constituent in it.

  1. Invar
  2. Steel
  3. Bell metal
  4. Bronze
AIPMT 2012 (Prelims)
8

Which of the statements is not true?

  1. On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed.
  2. Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.
  3. K2Cr2O7 solution in acidic medium is orange.
  4. K2Cr2O7 solution becomes yellow on increasing the pH beyond 7.
AIPMT 2012 (Prelims)
9

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
AIPMT 2011 (Prelims)
10

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)
11

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

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

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