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Which elements exhibit variable electrov...

Which elements exhibit variable electrovalency and why?

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Transition element,s this is because the outermost electron of the ns-subhshell and the penultimate (n-1)d. subshell are involved in bonding.
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CHHAYA PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE-WARM UP EXERCISE
  1. What do you mean by lattice energy of lattice enthalpy?

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  2. How will you determine the lattice energy of an ionic compound using B...

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  3. Which elements exhibit variable electrovalency and why?

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  4. State the importance of lattice enthalpy.

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  5. What do you mean by coodination number (C.N.)?

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  6. Explain why the melting and boiling points of ionic compounds are much...

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  7. Why the ionic compounds do not exhibit isomerism?

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  8. Which type of ionic compounds exhibit isomorphism?

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  9. What is solvation energy of solvation enthalpy?

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  10. What is the condition for dissolution of an ionic compound in a partic...

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  11. The ionic compounds are soluble in polar solvents but isoluble in non-...

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  12. Why do ionic compounds conduct electricity only in solution or molten ...

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  13. If r(+)//r(-) in equal to 0.53, what is the C.N. of the cation?

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  14. What do you mean by covalent bond and covalency?

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  15. Explain the formation of three molecules containing a single, a double...

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  16. Give the factors favouring formation of covalant bond.

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  17. Draw lewis dot structure of H(3)PO(4) and CO(3)^(2-).

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  18. Calculate formal change on N-atom in HNO(3) molecule.

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  19. Elements of which part of the periodic table exhibit greater tendency ...

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  20. Molecules of covalent compounds exhibit isomerism-why?

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