Atomos Test Generator Free PYQs ExamsMy practice Log in / Sign up free

d- and f-Block Elements

AIPMT 2015 (Cancelled)MCQEasyNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2015 (Cancelled)

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

  1. Zr(40) and Hf(72)
  2. Zr(40) and Ta(73)
  3. Ti(22) and Zr(40)
  4. Zr(40) and Nb(41)

Answer

(1) Zr(40) and Hf(72)

Solution

As per NCERT, the filling of 4f orbitals before 5d orbitals results in a regular decrease in atomic radii (lanthanoid contraction), which compensates the expected increase in size with increasing atomic number.

⇒ The radii of the 5d series elements are virtually the same as those of the corresponding 4d series members.

e.g. Zr (160 pm) and Hf (159 pm), both in group 4.

Answer: (1)

Keep practising — d- and f-Block Elements

Ques. 2AIPMT 2014

The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives

  1. Mn4+ and O2
  2. Mn2+ and O2
  3. Mn2+ and O3
  4. Mn4+ and MnO2
Ques. 3AIPMT 2014

Magnetic moment 2.83 BM is given by which of the following ions? (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

  1. Ti3+
  2. Ni2+
  3. Cr3+
  4. Mn2+
Ques. 4AIPMT 2014

Reason of lanthanoid contraction is

  1. negligible screening effect of 'f'-orbitals
  2. increasing nuclear charge
  3. decreasing nuclear charge
  4. decreasing screening effect.
Ques. 5NEET 2013

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
Ques. 6NEET 2013

Which of the following does not give oxygen on heating?

  1. K2Cr2O7
  2. (NH4)2Cr2O7
  3. KClO3
  4. Zn(ClO3)2
Ques. 7NEET 2013

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.
Ques. 8NEET 2013

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+
Ques. 9NEET 2013 (Karnataka)

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
Ques. 10NEET 2013 (Karnataka)

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.
Ques. 11AIPMT 2012 (Mains)

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

All d- and f-Block Elements PYQs →

PDFDownload d- and f-Block Elements PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry