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Is HCI cause hardness to water? What is the meaning 'Hardness is 300 ppm’?

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UNITED BOOK HOUSE-MODEL QUESTION PAPER 10-EXERCISE
  1. Which one of the following conditions will favour maximum formation of...

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  2. Give example of homogeneous & hetrogeneous equilibrium.

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  3. Is HCI cause hardness to water? What is the meaning 'Hardness is 300 p...

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  4. What is smog? State one harmful effect of N2O.

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  5. What are isodiaphers, Isotone & nuclear isomerism? Give example.

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  6. Which one has the highest paramanetic property and which one has least...

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  7. Find the position of the element having atomic number 24. In which blo...

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  8. What do you mean by Stair step diagonal? State its significance.

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  9. If the dipole moment and bond length of HF be 2.0 D and o.C.2A^@then f...

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  10. Explain why the viscosity and boiling point of H2SO4 is too high.Write...

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  11. What do you mean by surface tension? What is PI? How it is related wit...

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  12. What do you mean by enthalpy? Show that DeltaH= DeltaU + Delta nRT.

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  13. Define free energy. Comment for its change in a sponttaneous reaction.

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  14. Identify ABCD:A overset(Na) underset(LiqNH3)(rarr)B overset (CH3I)(rar...

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  15. If 4ml O2is obtained at 1.5atm pressure and 25^@C from 1 ml H2O2 sol...

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  16. How would you differch mically Na2CO3 & NaHCO3 which alkali metal form...

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  17. State the conditions of SN^2 reaction? What is I-effect?

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  18. What type of equilibrium 'is this 3Fe (s) + (g) f Fe3O4 (S) 4H2 (g)Di...

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  19. Shall phenolpthalein be used in neutralisation of Na2 CO3 by HC1? Why ...

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  20. Why CO Can't be dried using comes H2SO4? Give an example of a reaction...

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