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Which one does not belongs to Dobereiner...

Which one does not belongs to Dobereiner's triads ?i) Lithium (7.0) - Sodium (23.0) - Potassium (39.0) ii) Calcium (40.0) - Strontium (88.5) - Barium (137.0) iii) Manganese (55.0) - Selenium (78.0) - Iron (56.0)

A

(i)

B

(ii)

C

(iii)

D

(ii) & (iii)

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. The I.E of 'N' is more than oxygen even though the size of 'O' is less...

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  2. For which of the following elements, the electron affinity values are ...

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  3. Which one does not belongs to Dobereiner's triads ?i) Lithium (7.0) - ...

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  4. Element →H to F to Cl →Co & Ni to Br to Pd to I → Pt & Ir No 1 to 8 → ...

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  5. Differentiating electrons of some elements are as given, Na = 3s^1, Al...

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  6. 11(Na) 1s^2 2s^2 2p^6 3s^1. i) It is a s- block element, ii) It's vale...

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  7. Sc = 1s^22s^2 2p^6 3s^2 3p^6s 4s^2 3d^1.this is belongs to

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  8. B, Si, Ge,  As are:

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  9. Carbon and Nitrogen belongs to groups respectively

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  10. Consider the following changes a) M((g))^(+2) rarr M((g))^(+3) + e^...

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  11. Between ""(11) Na and ""(17) Cl, which one has more ionization...

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  12. Which one is true ? i) More nuclear charge, more ionization energy. i...

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  13. Penetration power towards nucleus of various orbitals are 4s g...

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  14. Electron affinity values in (KJ mol^(-)) F(-328), Cl-(349), Br(-325), ...

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  15. F(4.0), Cl(3.0), Li(1.0), Be (1.47) Electronegativity values are give...

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  16. B, Si, Ge,  As are:

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  17. Element with electronic configuration: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10...

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  18. In the 5^th period the orbitals being filled are

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  19. Which of the following has both members from the same period of the pe...

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  20. Which of the following is an element in 3^rd period II group

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