PYQSide ExamsMy practice

Classification of Elements and Periodicity in Properties · Question 39

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
1

Which of the following is isoelectronic?

  1. CO2, NO2
  2. NO2-, CO2
  3. CN-, CO
  4. SO2, CO2

Answer

(3) CN-, CO

Solution

Isoelectronic species have the same total number of electrons.

⇒ CO2 = 6 + 16 = 22; NO2 = 7 + 16 = 23

⇒ NO2- = 23 + 1 = 24; SO2 = 16 + 16 = 32

⇒ CN- = 6 + 7 + 1 = 14; CO = 6 + 8 = 14

∴ CN- and CO are isoelectronic.

Answer: (3)

AIPMT 2002

Keep practising — Classification of Elements and Periodicity in Properties

2

Which of the following order is wrong?

  1. NH3 < PH3 < AsH3 – acidic
  2. Li < Be < B < C – 1st IP
  3. Al2O3 < MgO < Na2O < K2O – basic
  4. Li+ < Na+ < K+ < Cs+ – ionic radius
AIPMT 2002
3

An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in which group?

  1. fifth
  2. fifteenth
  3. second
  4. third
AIPMT 2002
4

Correct order of 1st ionization potential among following elements Be, B, C, N, O is

  1. B < Be < C < O < N
  2. B < Be < C < N < O
  3. Be < B < C < N < O
  4. Be < B < C < O < N
AIPMT 2001

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