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Why is sulfurous acid a reducing agent ?...

Why is sulfurous acid a reducing agent ?

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Oxidation number of sulfur in sulfurous acid `(H_2SO_3)` is +4 which is less than its maximum oxidation state of +6. Since, oxidation state of sulfur can be increased from +4 to +6, `H_2SO_3` acts as a reducing agent.
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KALYANI PUBLICATION-P-BLOCK ELEMENTS-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Write the structural formula of PCl5(s).

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  2. What type of hybridization is involved in PCI5 ?

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  3. Why is sulfurous acid a reducing agent ?

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  4. Why do hydrides of oxygen and sulfur differ in physical state?

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  5. Which halogen has highest electron gain enthalpy?

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  6. Write the chemical equation for the following: Ca(3)(PO4)2 + SiO(2) ...

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  7. Why is nitrous acid oxidant as well as reductant ?

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  8. Which is least basic ? SbH(3)PH3,NH3,AsH3

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  9. Draw the structure of XeF2 molecule.

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  10. Among the noble gases only xenon is well known to form chemical compou...

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  11. Assign reason for the following: In solid state, PCI5 , behaves as an ...

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  12. Why does PCI3 fume in moisture? Give reaction.

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  13. Complete the following reactions : (i) P4 + SOCl2 rarr

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  14. Complete the following reactions : (ii) CH3COOH + PCl5 rarr

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  15. Write balanced equation when ammonia is dissolved in water.

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  16. In which one of the two structures NO(2)^(+) and NO2^(-), the bond ang...

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  17. Why is the bond angle in PH3 molecule lesser than in NH3 molecule?

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  18. Which neutral molecule would be isoelectronic with CIO^(-)?

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  19. Why is Bi(V) a stronger oxidant than Sb(V)?

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  20. Why is red phosphorus less reactive than white phosphorus?

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