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Give two allotropes of oxygen. Give one ...

Give two allotropes of oxygen. Give one method of preparation and two uses of each.

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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Questions From Board Examinations
  1. Write balanced chemical equations for the following reactions : (a) ...

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  2. Write balanced chemical equation for the following : (a) NaCl is hea...

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  3. Give two allotropes of oxygen. Give one method of preparation and two ...

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  4. Which xenon compound has distorted octahedral shape ?

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  5. How will you account for the following : (i) HI is a stronger acid t...

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  6. How are interhalogen compounds formed ? Write general compositions tha...

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  7. What happens when : (i) PCl(5), is heated (ii) H(3)PO(3) is heated

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  8. Bleaching of flowers by Cl(2) is permanent while bleaching by SO(2) is...

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  9. Arrange HClO, HBrO, HIO decreasing order of acidic strength.

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  10. Complete the equation XeF(6)+H(2)O to ? + ?

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  11. Draw the shapes of the following molecules : (i) XeOF(4) (ii) H(2)SO...

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  12. Write main differences between the properties of white phospghorus and...

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  13. The two O-O bond lengths in ozone molecule are equal. Assign reason.

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

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  15. How will you prepare PH(3) from (i) Metal phosphides (ii) H(3)PO(2) ...

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  16. Explain why nitrogen exists as a diatomic molecule and phosphorus at P...

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  17. Why are halogens strong oxidising agents ?

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  18. How will you prepare the following ? Give chemical equations also. (...

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  19. Why phosphorus is more reactive than nitrogen?

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  20. Why are the elements of group 17 generally coloured ?

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