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State the law on the basis of which Mend...

State the law on the basis of which Mendeleev classified the elements. Mention the important features of his periodic table. What are the merits and defects of Mendeleev's periodic table ?

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Give four defects of Mandeleev's periodic table.

On what basis did Mendeleev classify the elements ?

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State the merits of Mendeleev's classification of elements.

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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-ESSAY (LONG ANSWER) TYPE QUESTIONS
  1. Give a brief account of the historical developments in the classificat...

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  2. State the law on the basis of which Mendeleev classified the elements....

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  3. Compare the known properties of germanium with those predicted by Mend...

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  4. What is modern periodic law? Mention the important features of the lon...

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  5. Justify the position of hydrogen in the periodic table on the basis of...

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  6. What is the basis of splitting the long form of the periodic table int...

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  7. How can the elements be classified on the basis of their electronic co...

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  8. What do you understand by the term periodicity ? What is the main caus...

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  9. What do you understand by the term periodicity ? What is the main caus...

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  10. What do you understand by the term periodicity ? What is the main caus...

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  11. What do you understand by the term periodicity ? What is the main caus...

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  12. Define various types of atomic radii. Why is covalent radius smaller t...

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  13. What do you understand by first, second and third ionisation energies ...

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  14. Define electron gain enthalpy. Explain why electron gain enthalpies of...

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  15. Electron gain enthalpies of noble gases are negative.

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  16. Explain why : The electron affinities of Be and Mg are zero.

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  17. Which is more basic : LiOH or NaOH ?

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  18. Explain why : The second ionisation energy of Li is very high.

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  19. Write short notes on the following : Penetration effect

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  20. Write short notes on the following : lsoelectronic ions

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