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Complete the following reactions :Na2B4O...

Complete the following reactions :`Na_2B_4O_7+7H_2O rarr`

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UNITED BOOK HOUSE-MODEL QUESTION PAPER 2-EXERCISE
  1. [SiF6]^(2-) is known but [SiCI6]^(2-) is not. Give reasons.

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  2. Complete the following reactions :B2H6+3O2 rarr

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  3. Complete the following reactions :Na2B4O7+7H2O rarr

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  4. Write the structural formula of 3, 4, 4,5-tetramethylheptane.

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  5. Arrange the following in decreasing order of -I effect:-I, -Br, -Cl, -...

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  6. Why (CH3)3 overset ((+))(C) is more stable than overset ((+))(CH3) ?

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  7. Briefly mention the role of ozone present in stratosphere in protectin...

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  8. Calculate the uncertainty in velocity of a moving object of mass 25 g,...

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  9. Which series of lines of the hydrogen spectrum lies in the visible reg...

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  10. Nitrogen has positive electron gain enthalpy.Explain.

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  11. Arrange Mg, Al, Si and Na in the increasing order of their ionisation ...

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  12. What are the characteristics of the transition elements and why are th...

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  13. Between Fe^2+ and Fe^3+ which is smaller in size?

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  14. ortho-nitrophenol is less soluble is water than p- and m-nitrophenols ...

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  15. Determine the number of sigma and pi bonds in sulphuric acid.

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  16. In case of CO3^(2-) ion,all the C-O bond lengths are equal explain.

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  17. Define co-ordination number.

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  18. Density of a gas is founded to be 5.46 g//dm^3 at 27^@C and at 2 bar p...

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  19. Critical temperature of NH3 and CO2 are 405.5 K and 304.10 K respectiv...

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  20. Calculate the standard enthalpy of reaction at25^@C temperature for th...

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