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The first ionization enthalpies of Na,Mg...

The first ionization enthalpies of Na,Mg,Al and Si are in the order

A

`Na lt Mg gt Al lt Si`

B

`Na lt Mg lt Al gt Si`

C

`Na gt Mg gt Al gt Si`

D

`Na gt Mg gt Al lt Si`

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The correct Answer is:
A
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AAKASH INSTITUTE ENGLISH-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Assignment (Section -B)
  1. An atom with high electronegativity generally has :-

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  2. Ionic radii are

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  3. The first ionization enthalpies of Na,Mg,Al and Si are in the order

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  4. Which of the following has maximum number of unpaired electrons ?

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  5. Which of the following elements do not belong to the family indicated ...

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  6. If the atomic number of an element is 33, it will be placed in the per...

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  7. Which among the following elements has the highest value for third ion...

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  8. The screening effect of inner electrons of an atom can cause

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  9. The diagonal similarities are due to similar polarising powers for the...

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  10. Which of the following gradation in the properties is false, as we mov...

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  11. The increasing order of electron affinity values of O,S and Se is

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  12. The element which has highest II^(nd) I.E. ?

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  13. The element which has highest electron affinity ?

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  14. Electronegativity of an element is 1.0 on the Pauling scale. Its value...

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  15. Which of the following element has highest shielding constant ?

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  16. Which one of the following order is correct ?

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  17. Which one of the following oxides has highest acidic character ?

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  18. Electron gain enthalpy will be positive in

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  19. Enthalpy change in the following process is A+ e^(-) to A^(-) Delta H=...

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  20. Uub is the symbol for the element with atomic number-

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