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

Classification of Elements and Periodicity in Properties

NEET 2016 (Phase 1)Multiple CorrectMedium📈 Topic in 12% papers+4−1
Ques. 1NEET 2016 (Phase 1)

In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?

  1. I < Br < Cl < F (increasing electron gain enthalpy)
  2. Li < Na < K < Rb (increasing metallic radius)
  3. Al3+ < Mg2+ < Na+ < F- (increasing ionic size)
  4. B < C < N < O (increasing first ionisation enthalpy)

Answer

(1) I < Br < Cl < F (increasing electron gain enthalpy), (4) B < C < N < O (increasing first ionisation enthalpy)

Solution

(1) As per NCERT, Cl has the most negative electron gain enthalpy; F is less negative than Cl because of its small size (strong inter-electronic repulsion in the compact 2p subshell). So the correct order of magnitude is I < Br < F < Cl, and the given order does not agree.

(2) Metallic radius increases down the group, Li < Na < K < Rb, so it agrees.

(3) For isoelectronic species (10 electrons), size decreases as nuclear charge increases, so Al3+ < Mg2+ < Na+ < F- agrees.

(4) ∵ N has a stable half-filled 2p3 configuration, its first ionisation enthalpy is higher than that of O. So the correct order is B < C < O < N, and the given order does not agree.

∴ Options (1) and (4) do not agree with the property indicated.

Answer: (1), (4)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2AIPMT 2015

The formation of the oxide ion, O2-(g) from oxygen atom requires first an exothermic and then an endothermic step as shown below: O(g) + e- O-(g); H = -141 kJ mol-1 O-(g) + e- O2-(g); H = +780 kJ mol-1 Thus, process of formation of O2- in gas phase is unfavourable even though O2- is isoelectronic with neon. It is due to the fact that,

  1. O- ion has comparatively smaller size than oxygen atom
  2. oxygen is more electronegative
  3. addition of electron in oxygen results in larger size of the ion
  4. electron repulsion outweighs the stability gained by achieving noble gas configuration.
Ques. 3AIPMT 2015 (Cancelled)

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

  1. Ca2+ < K+ < Ar
  2. K+ < Ar < Ca2+
  3. Ar < K+ < Ca2+
  4. Ca2+ < Ar < K+
Ques. 4AIPMT 2014

Which of the following orders of ionic radii is correctly represented?

  1. H- > H > H+
  2. Na+ > F- > O2-
  3. F- > O2- > Na+
  4. Al3+ > Mg2+ > N3-
Ques. 5NEET 2013 (Karnataka)

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

  1. Al < Ca < O < C < F
  2. Al < O < C < Ca < F
  3. C < F < O < Al < Ca
  4. Ca < Al < C < O < F
Ques. 6AIPMT 2012 (Prelims)

Identify the wrong statement in the following.

  1. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
  2. Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.
  3. Atomic radius of the elements increases as one moves down the first group of the periodic table.
  4. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.
Ques. 7AIPMT 2011 (Mains)

What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

  1. -5.1 eV
  2. -10.2 eV
  3. +2.55 eV
  4. +10.2 eV
Ques. 8AIPMT 2011 (Mains)

Which of the following oxide is amphoteric?

  1. SnO2
  2. CaO
  3. SiO2
  4. CO2
Ques. 9AIPMT 2010 (Mains)

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

  1. Mg < Ca < Cl < P
  2. Cl < P < Mg < Ca
  3. P < Cl < Ca < Mg
  4. Ca < Mg < P < Cl
Ques. 10AIPMT 2010 (Mains)

Among the following which one has the highest cation to anion size ratio?

  1. CsI
  2. CsF
  3. LiF
  4. NaF
Ques. 11AIPMT 2010 (Prelims)

The correct order of the decreasing ionic radii among the following isoelectronic species is

  1. Ca2+ > K+ > S2- > Cl-
  2. Cl- > S2- > Ca2+ > K+
  3. S2- > Cl- > K+ > Ca2+
  4. K+ > Ca2+ > Cl- > S2-

All Classification of Elements and Periodicity in Properties PYQs →

PDFDownload Classification of Elements and Periodicity in Properties 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