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Write the chemical equation for the foll...

Write the chemical equation for the following :
`Ca_(3)(PO_(4))_(2) + SiO_(2) + C overset("Heat")to`

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`2 Ca_(3)(PO_(4))_(2) + 6 SiO_(2) + 10C overset(1773 K)rarr 6 CaSiO_(3) + P_(4) + 10 CO`
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PRADEEP-P-BLOCK ELEMENTS -VERY SHORT ANSWER QUESTIONS
  1. In the ring test for identification of nitrate ion, what is the formul...

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  2. Important allotropic forms of phosphorus are white phosphorus, red pho...

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  3. Write the chemical equation for the following : Ca(3)(PO(4))(2) + Si...

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  4. Why is white phosphorus kept under water ?

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  5. How will you obtain phosphine from phosphorus ?

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  6. On being slowly passed through water, PH(3) forms bubbles but NH(3) di...

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  7. Give the chemical equation for the reaction the occurs between iron an...

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  8. What happens when PCl(5) is heated ?

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  9. Why is PCl(5) more covalent than PCl(3) ?

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  10. Why does PCl(5) fume in moisture ?

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  11. Complete the following reactions : (i) P(4) + SOCl(2) rarr (ii) CH...

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  12. Suggest a method for the laboratory preparation of DCl. Write a balan...

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  13. What is the oxidation number of phosphorus in H(3)PO(2) molecule ?

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  14. What should be the order of acidic strength in the series H(3)PO(4), H...

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  15. Why does H(3)PO(3) act as a reducing agent but H(3)PO(4) does not ?

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  16. Why does orthophosphoric acid exist as a syrupy liquid ?

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  17. How is pyrophosphoric acid related to orthophosphoric acid ?

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  18. Why are the group 16 element called chalcogens ?

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

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  20. Write the structure of a chalcogenide dianion.

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