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What is Holme's signals? Write its use...

What is Holme's signals? Write its use

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R G PUBLICATION-THE p-BLOCK ELEMENTS-EXERCISE
  1. Write two characteristics each from white phos-phorus and red phosphor...

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  2. Write the reaction for the laboratory prepara-tion of phosphine. How p...

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  3. What is Holme's signals? Write its use

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  4. Bond angle in PH4^+ is higher than that is PH3.

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  5. What is the hydridization of phosphorus atom in PCI3?

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  6. Give the disproporationation reaction of H3PO3.

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  7. Discuss the stability of various oxidation states of element of chalco...

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  8. How oxides are classified? Give one example of each oxide.

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  9. High concentration of ozone is highly explo-sive. Why?

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  10. Knowing the electron gain enthalphy values for OrarrO^- and O rarrO^2-...

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  11. Discuss the role of chemical factors which deptets ozone layer.

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  12. Why does O3 act as a powerful oxiding agent? How is O3 estimated quant...

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  13. Write two differences between rhombic sulpher and monoclinic sulpher.

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  14. Comment on the nature of S-O bonds formed in SO2 molecule. Are these b...

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  15. How is SO2 an air pollutant?

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  16. Describe the conditions of maximum yield of SO3 by contact process in ...

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  17. Write the formula of carnallite and fluoroaptite.

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  18. Account for the following: Halogen are coloured.

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  19. Why fluorine shows only one oxidation state of (-1)?

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  20. Discuss the various factors which affect the decreasing oxidising abil...

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