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Define co-valency....

Define co-valency.

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CBSE COMPLEMENTARY MATERIAL-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -2- MARKS QUESTIONS
  1. First ionisation energy of boron is less than Be but size of Be is les...

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  2. Electron gain enthalpy of Mg is positive. Explain.

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  3. Define co-valency.

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  4. The reactivity of halogens decrease down the group but of alkali metal...

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  5. Name a halogen, a metal and a group13 element which are liquid at 30^...

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  6. The reducing power of elements increases down the group but reverse is...

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  7. What is the formula of binary compound formed between : 1st element...

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  8. What is the formula of binary compound formed between : 2nd element...

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  9. Arrange in the following in increasing order of property indicated: ...

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  10. Arrange the following in increasing order of property indicated: Oxi...

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  11. Oxygen is more non-metallic than nitrogen but less than fluorine why ?

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  12. LiCl, LiBr, LiI are covalent as well as ionic why ?

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  13. PbCl2 is more stable than PbCl4 . Why ?

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  14. Magnesium and Lithium both form nitrides why ?

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  15. Which has least I.E. [3p^(3), 3p^(6) ,2p^(3),2p^(6)]

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  16. I.E. of sulphur is lower than chlorine.

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  17. Arrange the following in decreasing order of their electro-negativity:...

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  18. Element ‘A’ in group 17 (2nd period) ‘B’ in group 16 (2nd peri...

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  19. Element ‘A’ 13 group forms ionic compounds. Write the : Formula of i...

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  20. Arrange the following in their decreasing electro-positive character ...

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