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Though copper, silver and gold atoms hav...

Though copper, silver and gold atoms have completely filled sets of d-orbitals, yet they are considered as transition metals. Why?

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Cations of these elements `(Cu^(2+), Ag^(2+), Au^(3+))` have partially filled sets of d-orbitals.
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What are d -block elements? Why are they called transition metals?

Explain the following terms : (a) Chemistry of all Lanthanoids is so identical . (b) Silver atom has completely filled d- orbitals (4d^(10)) in its ground state . How can you say that is a transition elements ?

The colours of the transition metal are due to d-d excitation. The energy required for d-d electron axcitation is available in the visible range. Transition metal ions have the tendency to absorb certain rediations from the visible region and exhibit the complementary colour. The transition metal ions which have completely filled d-orbitals are colourless as the excitation of electron or electrons is not possible within d-orbitals. The transition metal ions which have completely empthy d-orbitals are also colourless. In KMnO_4 and K_2Cr_2O_7 , there are no unpaired electrons at the central atom but they are dep in colour. The colour of these compounds is due to charge transfer spectrum. for example in MnO_4 electron is momentrily transferred from O to the metal and thuys oxygen changes from O^(2-) and O^(ɵ) maganese from Mn^(7+) to Mn^(6+) . Q. Which of the following is paramagnetic as well as coloured ion?

The colours of the transition metal are due to d-d excitation. The energy required for d-d electron axcitation is available in the visible range. Transition metal ions have the tendency to absorb certain rediations from the visible region and exhibit the complementary colour. The transition metal ions which have completely filled d-orbitals are colourless as the excitation of electron or electrons is not possible within d-orbitals. The transition metal ions which have completely empthy d-orbitals are also colourless. In KMnO_4 and K_2Cr_2O_7 , there are no unpaired electrons at the central atom but they are dep in colour. The colour of these compounds is due to charge transfer spectrum. for example in MnO_4 electron is momentrily transferred from O to the metal and thuys oxygen changes from O^(2-) and O^(ɵ) maganese from Mn^(7+) to Mn^(6+) . Q. Select the correct statement:

The colours of the transition metal are due to d-d excitation. The energy required for d-d electron axcitation is available in the visible range. Transition metal ions have the tendency to absorb certain rediations from the visible region and exhibit the complementary colour. The transition metal ions which have completely filled d-orbitals are colourless as the excitation of electron or electrons is not possible within d-orbitals. The transition metal ions which have completely empthy d-orbitals are also colourless. In KMnO_4 and K_2Cr_2O_7 , there are no unpaired electrons at the central atom but they are dep in colour. The colour of these compounds is due to charge transfer spectrum. for example in MnO_4 electron is momentrily transferred from O to the metal and thuys oxygen changes from O^(2-) and O^(ɵ) maganese from Mn^(7+) to Mn^(6+) . Q. Which is a coloured ion?

The colours of the transition metal are due to d-d excitation. The energy required for d-d electron axcitation is available in the visible range. Transition metal ions have the tendency to absorb certain rediations from the visible region and exhibit the complementary colour. The transition metal ions which have completely filled d-orbitals are colourless as the excitation of electron or electrons is not possible within d-orbitals. The transition metal ions which have completely empthy d-orbitals are also colourless. In KMnO_4 and K_2Cr_2O_7 , there are no unpaired electrons at the central atom but they are dep in colour. The colour of these compounds is due to charge transfer spectrum. for example in MnO_4 electron is momentrily transferred from O to the metal and thuys oxygen changes from O^(2-) and O^(ɵ) maganese from Mn^(7+) to Mn^(6+) . Q. Which of the following compounds is (are) coloured due to charge transfer spectra and not due to d-d transition?

ICSE-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. How many transition series of elements are there in the periodic table...

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  2. How many elements are present in the d-block of the periodic table?

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  3. Though copper, silver and gold atoms have completely filled sets of d-...

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  4. What are the two important oxidation states of group 6 elements of the...

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  5. Which is the most stable oxidation state of titanium (Z=22) in aqueous...

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  6. The electronic configuration of an element is 3d^5 4s^1. Write its (i)...

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  7. Write the highest oxidation state shown by an element with atomic numb...

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  8. Why are compounds of transition elements generally coloured ?

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  9. Why does vanadium pentoxide acts as a catalyst?

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  10. What is the common oxidation state of Cu, Ag and Au?

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  11. Name the metal with tripositive ion represented by the configuration :...

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  12. Out of Cr^(2+) and Cr^(3+), which one is stable in aqueous solution?

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  13. What is meant by 'disproportionation'? Give an example of disproporti...

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  14. Which elements are called ferrous metals ?

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  15. What are platinum metals ?

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  16. What is the highest oxidation state shown by a transition element.

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  17. Name one ore each of manganese and chromium.

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  18. What do you mean by 18 carat gold ?

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  19. Out of Al, Zn, Mg and Fe which is the densest element?

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  20. Which is more stable Fe^(2+) or Fe^(3+)? Why ?

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