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The transition elements (d-blocks elemen...

The transition elements (d-blocks elements) show variable oxidation states because

A

Of the presence of ns ,np and nd electrons

B

The energy difference between (n-1)d and ns electrons is very less , thus (n-1)d electrons also behave like valence electrons

C

Of the presence of ns and nd orbitals

D

Of the presence of electrons in np and nd orbitals

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The correct Answer is:
B
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NARAYNA-PERIODIC TABLE -All Questions
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  2. The C-C single bond length is 1.54 A^(@) and that of Cl-Cl is 1.98 A^(...

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  3. The transition elements (d-blocks elements) show variable oxidation st...

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  4. The correct order of electron affinity of B , C , N and O is

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  5. The electronegativity of oxygen and an element A on Pauling 's scale a...

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  6. The IE(1) of Cs is 376 kj/mole . The number of Cs atoms that can be co...

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  7. It has been found that the atoms combine to form bonds in order to kee...

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  8. A' Chloride of an element gives neutral solution in water . In the per...

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  9. The correct order of radii is:

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  10. The incorrect statement Among the following is A)The first ionisation...

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  11. The decreasing order of the second ionisation potential of K , Ca and ...

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  12. In the descending order of a group in the periodic table which of the ...

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  13. Which of the following represents second ionization potential ?

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  14. Ionisation energy values of an atom are 495 , 767 , 1250 and 4540 kJ "...

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  15. If electro negativity of x be 3.2 and that of y be 2.2 , the percentag...

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  16. The electronegativity of carbon from the following data is nearly E(...

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  17. Which of the following statements is incorrect ?

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  18. S-1 : Formation of Mg^(2+) and Al^(3+) , both require the absorption o...

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  19. N(0)//2 atoms of X(g) are converted into X^(+) (g) by energy E(1) . N(...

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  20. Which of the following triads have approximately equal size ?

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