Ecat Entry Test Chemistry Classification Of Elements and Periodicity MCQs

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Periodic classification of elements, Newland’s Law of Octave, Modern Periodic Table, Atomic Size, Basic Character of Oxides.

The attainment of superior scores in the ECAT entry test requires students to master fundamental concepts of the Chemistry Classification Of Elements and Periodicity. Time and multiple scientific laws and principles led to the development of the periodic table which organized elements according to their characteristics. Each classification technique including Newland’s Law of Octaves started from different chronological points to help develop our understanding of how elements behave. The information in this guide includes basic definitions together with periodic trends alongside multiple-choice questions to help readers prepare better.

Ecat Entry Test Chemistry Classification Of Elements and Periodicity MCQs

Chemistry Classification Of Elements and Periodicity

Newland’s Law of Octaves

John Newland introduced the Law of Octaves, stating that every eighth element had similar properties when arranged in increasing atomic mass. However, this pattern was limited to lighter elements and failed for heavier ones.

Mendeleev’s Periodic Table

Dmitri Mendeleev organized elements according to their increasing atomic masses yet he reserved blanks in his arrangement for undiscovered elements. The approach succeeded at identifying new elements yet it contained two main flaws regarding atomic mass arrangement and isotope positioning.

Modern Periodic Table

The Modern Periodic Law established by Henry Moseley dictates that elements should be arranged through increasing atomic numbers instead of atomic masses. The modern ordering of elements according to atomic number fixed the deficiencies in Mendeleev’s table which produced better element classifications.

Periodic Trends

  1. Atomic Size – Increases down a group and decreases across a period.
  2. Ionization Energy – Energy required to remove an electron; decreases down a group, and increases across a period.
  3. Electronegativity – Fluorine has the highest electronegativity (4.0).
  4. Oxidation States – Elements exhibit various oxidation states depending on their group.
  5. Basic Character of Oxides – Increases down a group in metals, while non-metals form acidic oxides.

MCQs: Chemistry Classification Of Elements and Periodicity

1. E.N. value of fluorine is ?

  • 4.0correct
  • 3.5
  • 2.5
  • 2.1

2. Atomic radius changes from top to bottom in a group ?

  • Sometimes increases & decrease
  • Increasecorrect
  • Remains same
  • Decrease

3. Sodium belongs to block of periodic table ?

  • s-blockcorrect
  • f-block
  • d-block
  • p-block

4. Modern Periodic Table is based upon periodic function ?

  • Nuclide number
  • Atomic mass
  • Mass number
  • Atomic numbercorrect

5. Mark the incorrect statement ?

  • Melting points of halogens remain the same throughout the group
  • Melting points of halogens first increase and then decrease down the group
  • Melting points of halogens increase down the groupcorrect
  • Melting points of halogens decreases down the group

6. Element with higher oxidation state form oxides ?

  • Peroxides
  • Basic
  • Amphoteric
  • Acidiccorrect

7. Which statement is incorrect ?

  • All the metals are good conductor of heat
  • All the metals form positive ions
  • All the metals are good conductor of electricity
  • All the metals form acidic oxidescorrect

8. Oxidation state of an element in free state is ?

  • Zerocorrect
  • Its number of electrons gained
  • Its number of electrons lost
  • Its number of electrons shared

9. Hydrides are ?

  • Ionic
  • Intermediate
  • Covalent
  • All abovecorrect

10. Keeping in view the size of atoms, which order is the correct one ?

  • Lu > Ce
  • Cl > I
  • Ba > Mg
  • Mg > Srcorrect

11. Which group elements are the least metallic in nature ?

  • IV-A
  • V-A
  • VII-Acorrect
  • VI-A

12. Mark the correct statement ?

  • All lanthanides are present in the same group
  • All the alkali metals are present in the same groupcorrect
  • All halogens are present in the same period
  • All the noble gases are present in the same period

13. Period Number 6 contains elements in it ?

  • 8
  • 18
  • 2
  • 32correct

14. Which one was the problem associated with Mendleev periodic table ?

  • System study
  • Prediction of unknown
  • Introduction of group and periods
  • Grouping of alkalicorrect

15. Oxidation state of boron, aluminium and gallium is ?

  • +5
  • +2
  • +3correct
  • +1

16. Newland’s gave law ?

  • Octaves lawcorrect
  • Triad’s law
  • Modern periodic law
  • Periodic law

17. Mark the correct statement ?

  • Boiling points of group IV-A hydrides decrease down the group
  • Ionic character of hydrides increase from left to right in a period
  • Covalent character of metal halides increase from left to right in a periodcorrect
  • The basicity of group II-A oxides decrease on descending the group

18. Electron affinity value from higher to heavier element ?

  • Decrease
  • Increasecorrect
  • Remains same
  • No effect

19. Ionization energy of sodium is (Kj/mol) ?

  • 513correct
  • 523
  • 524
  • 503

20. Mark the correct statement ?

  • Electron affinity is measure of energy released by removing an electron
  • Electron affinity is a measure of energy required to remove the electron
  • Electron affinity is a measure of energy required to excite an electron
  • Ionization energy is a measure of energy asked by removing an electroncorrect

21. Binary compounds of hydrogen are called ?

  • Halides
  • Oxides
  • Nitrides
  • Hydridescorrect

22. Properties of metals are ?

  • Malleable and ductile
  • Tarnish in air
  • Form basic oxides
  • All are truecorrect

23. The element not know till Mendleev tabulated his periodic table ?

  • Carbon
  • Aluminium
  • Hydrogen
  • Germaniumcorrect

24. Mark the correct statement ?

  • The ionization energy of calcium is lower than that of strontium
  • The ionization energy of calcium is lower than that of magnesiumcorrect
  • The ionization energy of calcium is lower than that of barium
  • The ionization energy of calcium is lower than that of beryllium

25. Hydration energy depends upon ?

  • Charge of ion
  • Charge to size ratiocorrect
  • Size of ion
  • Heat changes

Conclusion

The fundamental basis for studying element behavior exists through the Chemistry Classification Of Elements and Periodicity system. Element properties and reactions become predictable by analyzing how atomic size works along with ionization energy and oxidation state trends. One must master these concepts and practice multiple-choice questions to succeed in ECAT entry examinations. Additional chemistry study materials alongside practice problems are available at Nokryan.com so continue investigating these resources.

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