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d- and f-Block Elements · Question 37

AIPMT 2014MCQEasy📈 Topic in 25% papers+4−1
1

Reason of lanthanoid contraction is

  1. negligible screening effect of 'f'-orbitals
  2. increasing nuclear charge
  3. decreasing nuclear charge
  4. decreasing screening effect.

Answer

(1) negligible screening effect of 'f'-orbitals

Solution

As per NCERT, lanthanoid contraction is due to the imperfect shielding of one electron by another in the same set of 4f orbitals.

⇒ The poor screening of 4f electrons cannot balance the increase in nuclear charge from La to Lu.

∴ The effective nuclear charge increases and the atomic / ionic size decreases steadily.

Answer: (1)

AIPMT 2014

Keep practising — d- and f-Block Elements

2

KMnO4 can be prepared from K2MnO4 as per the reaction, 3MnO42- + 2H2O 2MnO4- + MnO2 + 4OH- The reaction can go to completion by removing OH- ions by adding

  1. CO2
  2. SO2
  3. HCl
  4. KOH
NEET 2013
3

Which of the following does not give oxygen on heating?

  1. K2Cr2O7
  2. (NH4)2Cr2O7
  3. KClO3
  4. Zn(ClO3)2
NEET 2013
4

Which of the following statements about the interstitial compounds is incorrect?

  1. They are much harder than the pure metal.
  2. They have higher melting points than the pure metal.
  3. They retain metallic conductivity.
  4. They are chemically reactive.
NEET 2013
5

Which of the following lanthanoid ions is diamagnetic? (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

  1. Eu2+
  2. Yb2+
  3. Ce2+
  4. Sm2+
NEET 2013
6

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
NEET 2013 (Karnataka)
7

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)
8

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)
9

Which of the following exhibits only + 3 oxidation state?

  1. U
  2. Th
  3. Ac
  4. Pa
AIPMT 2012 (Mains)
10

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)
11

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)

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