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What do you mean by ortho and para hydro...

What do you mean by ortho and para hydrogen ? explain why the chemical properties of ortho and parahydrogen are the same but their physical properties are different.

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UNITED BOOK HOUSE-MODEL QUESTION PAPER 8-EXERCISE
  1. Balance by ion electron method : Zn + NaNO3 rarr Na2ZnO2 + NH3 + H2O

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  2. Mention the oxidation number of Cr atom in CrO5 molecule.

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  3. What do you mean by ortho and para hydrogen ? explain why the chemical...

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  4. Lithium forms monoxide while sodium forms peroxide in the presence of ...

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  5. Which alkali metal is used for making photoelectric cells?

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  6. Both alkaline earth metals and their salts are diamagnetic in nature e...

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  7. What happens when sodium peroxide dissolves in water.

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  8. Dipole moment of vinyl chloride (CH2 = CHCI) is less than ethyl chlori...

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  9. Arrange the following ions in order of increasing basicit :- CH3CH2, C...

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  10. Which of two : O2N < H2CH2O or CH3CH2O^(-) is more stable and why?

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  11. Give example of an ambident nucleophile.

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  12. A 0.l (M) solution of acetic acid is 1.34% ionised at 25^@C. Calculate...

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  13. consider the reaction aX2(g)+bY2(g)overset(rarr)(larr)XY(g) theat and ...

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  14. What will be the effect of addition of an inert gas in the following e...

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  15. Give example of an acidic and an alkaline buffer solution. Explain the...

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  16. What concept can justify that NH3 + BF3 rarr NH3 BF3 is an acid base ...

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  17. How will you convert :- Carbon dioxide into carbon monoxide and carbon...

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  18. Explain why N(CH)3)3 is more basic than N(SiH3)3.

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  19. What is thermit mixture? Mentain one use of it.

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  20. Convert acetylene into but-2-ene.

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