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Which pair of atomic numbers represents ...

Which pair of atomic numbers represents s-block elements ?

A

7, 15

B

6, 12

C

9, 17

D

3, 12.

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The correct Answer is:
D
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ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTIONS
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  2. Which is the weakest base among NaOH, Ca(OH)(2), KOH and Zn(OH)(2)?

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  3. Which pair of atomic numbers represents s-block elements ?

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  4. Which pair of elements has the same characteristic chemical properties...

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  5. The values of IE(1),IE(2),IE(3),IE(4) and IE(5) of an element are 7.1,...

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  6. The incorrect statement among the following is

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  7. Ionic radii of

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  8. Correct order of radii

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  9. The correct order of first ionisation potential is

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  10. Among the following complex ions, the species whose central metal atom...

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  11. According to the periodic law of elements, the variation in properties...

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  12. The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and ...

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  13. Which one of the following ions has the highest value of ionic radius?

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  14. The formation of the oxide ion O^(2-) (g) requires first an exothermic...

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  15. Fluorine is the best oxidising agent because it has

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  16. The first ionisation enthalpy of the elements C,N,P,Si are in the orde...

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  17. Following statements regarding the periodic trends of chemical reactiv...

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  18. The increasing order of the ionic radii of the given isoelectronic spe...

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  19. Correct order of electron gain enthalpy (Kj/mole) of F, Cl, Br, I

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  20. The correct sequence which shows decreasing order of the ionic radii o...

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