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Which block element in the periodic tabl...

Which block element in the periodic table does not show variable valancy?

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UNITED BOOK HOUSE-MODEL QUESTION PAPER 6-EXERCISE
  1. Give an example of non daltonic compound?

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  2. Why Scandium can't form colour compound? Write the general electronic ...

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  3. Which block element in the periodic table does not show variable vala...

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  4. State to state function of a system.

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  5. What is used in Friedel Craft reaction instead of AICl3?

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  6. Calculate the water of crystallization in CuSO4. When 1 gm hydrated Cu...

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  7. Show that the atomic weight of Metal M having equivalent weight x form...

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  8. 1eV = How much Joule? What do you understand by the term isostere?

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  9. It the energy of 1st Bohr orbit be 13.6eV of a hydrogen atom, then cal...

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  10. Why the melting point of Boron is so high? State one use of Boron Carb...

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  11. Why the phenolphthalein turns pink in borax solution? Why it becomes c...

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  12. Why Na Is taken in excess in Lassigne's test?

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  13. What is TLV? Write one harmful effect of PAN?

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  14. Write two difference between orbit anoorbital. What difference will be...

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  15. Calculate wavelength of a photon having energy 1.2 ev. (1 ev = 1.601 x...

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  16. What in inner transition metal? Give one example of inert pair effect.

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  17. Define ionisation potential. State its change down a group.

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  18. How many sigma & pi bonds are there in propene molecule. State the hyb...

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  19. Dipole moment and bond length of A B type molecule are 7.42 D 2.04 ove...

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  20. State Grahams law of difussion from kinetic theory of gases. What do y...

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