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Name three allotropes of phosphorus. Whi...

Name three allotropes of phosphorus. Which out of these is most reactive?

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### Step-by-Step Solution: 1. **Identify the Allotropes of Phosphorus**: - The three allotropes of phosphorus are: - White (or Yellow) Phosphorus - Red Phosphorus - Black Phosphorus ...
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Assertion (A) Elementary phosphorus exists in three principal allotropic forms , ie .white (or yellow),red (or violet ) and black. Reason (R ) Of the three forms, white phosphorus is the most important and most reactive.

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ICSE-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Name two oxoacids of nitrogen and write the oxidation state of nitroge...

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  2. What is the difference between the nature of pi-bonds present in H3PO3...

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  3. Name three allotropes of phosphorus. Which out of these is most reacti...

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  4. Why is white phosphorus stored under water?

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  5. How is pyrophosphoric acid related to orthophosphoric acid?

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  6. Give reasons for the following : (i) Nitric oxide become brown on ex...

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  7. Give reasons for the following : NO2 is considered a mixed anhydride.

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  8. What is the basicity of phosphorus acid ?

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  9. Name the series of salts that are formed by orthophosphoric acid with ...

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  10. What is the state of hybridization of nitrogen in NO3^(-) ion ?

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  11. NO2 readily forms a dimer. Explain.

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  12. What is laughing gas ? How is it prepared?

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  13. On being slowly passed through water, PH3 forms bubbles but NH3 dissol...

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  14. Why does H3PO3 act as a reducing agent but H3PO4 does not?

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  15. Mention one use of hydrazine.

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  16. Basicity of H3PO2, H3PO3 and H3PO4 is not the same. Explain

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  17. What are chalcogens ? Why are group 16 elements called chalcogens ?

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  18. What is the outer shell electronic configuration of chalcogens?

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  19. Name the allotropes of oxygen.

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  20. Which element of group 16 has maximum tendency for catenation ?

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